很少发生

It is very rare or almost impossible that an event can be negative from all points of view. Therefore, it is useful when something happens to try to look at it from different angles and then you can see the positive or beneficial aspects.

一件事情很少或几乎不可能只从其中看到负面的意义；所以当某些事情发生时，尝试以不同角度来看待是很有用的，这样你便能看到正面或有益的面向。

In the single crystal of C60 with a FCC structure,positron mainly appears outside the C60 molecule.The main annihilation space is the interspace between molecules.The calculated positron bulk lifetime in C60 is 352ps, which agrees with experiment value of 356ps in literature.In carbon nanotube bundles with different dimeters,as the diameter of carbon nanotubes increases,the main space where positron appears changes from the interspace of carbon tubes to the space inside carbon tubes,the radio between positron annihilation with valence eletrons and core eletrons becomes larger,the positron bulk lifetime in carbon nanotube increase rapidly first and come to be a constant at the end.The calculated positron lifetime of carbon nanotube with a dimeter of 0.8～1.6ns is 332～470ps,which agrees with the experiment value of 394ps.Positron annihilation has been studied in widly used compound semiconductors.

计算结果表明：在片层结构的石墨晶体中，正电子主要在石墨层间的空隙中湮没，计算出的石墨中的正电子寿命为208 pS，与文献中的实验结果215 ps符合很好；在金刚石单晶中，正电子主要在碳原子之间的空隙中存在并发生湮没，计算出的金刚石中的正电子寿命为115 ps，文献中的实验结果110 ps左右符合；在面心立方结构的C60晶体中，正电子主要在C60分子球壳内外侧及分子之间存在，C60球形分子中心正电子分布很少，正电子的湮没区域集中在C60分子之间的空隙区域，计算出的C60中的正电子寿命为352 ps与文献中的实验结果356ps相符合；对于不同管径碳米管束中的正电子分布，随着碳纳米管直径的增加，碳纳米管束中的正电子由主要在碳纳米管管间的区域出现转变为主要在碳纳米管管内中心的区域出现：碳纳米管束中的正电子与碳原子的价电子的湮没概率变得越来越大，与核心电子的湮没概率变得越来越小；碳纳米管束中正电子的湮没寿命先迅速增大，而后趋于一定值。

The Mayo Clinic says that could be true if they have not exercised in the past.

梅奥诊所指出如果这些在过去很少锻炼的话，这样的情况是很容易发生的。

In order to understand the biology of apple ring spot fungi further and solve the problem of less conidiophores generated during their inducing culture in vitro, it was studied that the effect of culture medium pH, incubation temperature, light sources, and light regiment on growth of mycelia and generation of conidiophores, and the removing of mycelia on generation of conidiophores.

为进一步了解苹果轮纹病菌的生物学特性，解决其在离体培养条件下产生分生孢子很少的问题，研究了培养基pH值、培养温度、光源和光照条件对菌丝体生长和分生孢子发生的影响以及刮除菌丝体对分生孢子发生的影响。

Goodness'''the live i'm living now seems too dull and decadent''''but i'm still a optimism''kakak'''although some difficult problems hv taken place in my life''such as my homework''money'ha ha 'and so on ''so i hv to make great effort to solve them alone'' '''so pity ar'' 'wel''few people understand me who i will treasure very much''''friends ar essential in your life'''''however''sometimes u must learn to be stay only by yourself''once' u go to trouble ''dun be upset and sned for sb.

善良'' '活'我米，现在的生活似乎太单调颓废'' ''但我'米仍是一个乐观''高速公路'' '虽然有些困难高压发生在我的生命''如我的功课''钱'呵呵'等关于''所以高压作出很大的努力来解决他们独自'' ' ''所以可惜氩'' ' '' wel很少人知道我是谁我将十分珍惜''朋友''氩必需在你的生命''''' ''但是有时美国必须学会将只留下自己''一旦美国' 去麻烦''逼债被打破和SNED为锑。

The result pointed out that the vertical distribution of foliage for each species was different,however,generally speaking,the foliage in upper crown (0.3CL) for broad-leaved species in natural secondary forest took a small percentage,about 10%;in middle or middle lower of the crown(0.4CL to 0.8CL) the branches here took the majority percentage of whole foliage,almost 60%to 75%;but in lower crown(0.8CL),there was about 10%of whole foliage.(5)The interspecies competition of trees in secondary forest was expressed by Hegyi competitioin index,and the active competitor was calculated by the competition zone radius and the tree position,DBH,and distance in the zone,it was not all competitors in tranditional calculation.The study introduced crown area overlap index to describe the crown competition between subject tree and its competitors,furthermore,the crown area was classified into 5 levels with a method of equal crown projection area,therefor,the resulting crown area overlap index showed more realities of existing stand conditons.(6)Based on the theoretics of multiply divide,the spatial strcture optimizing model of secondary forest stand selective thinning was developed by diversity mingling,aggregation index,competition index and crown area overlap index,also designed 10 constraint conditions which were related to forestry meanings,the objective function was solved by the implicit enumeration method with LINGO 9.0,using 0-1 integer programming.

并且得出，每个树种在树冠内相对高度上的叶量的垂直分布是不同的，天然次生林阔叶树种的叶量在树冠的上部(0.3CL以下)所占比例很小，约占10%左右；在树冠的中部以及中下部(0.4CL～0.8CL)，叶量所占比例最大，几乎集中了整个树冠60%～75%的叶量；而在树冠的下部(0.8CL以下)，几乎占很少的叶量，大约10%左右。5、采用Hegyi竞争指数来表现次生林内林木的竞争关系，并且根据竞争圈的大小和林木在竞争圈内的分布位置、大小与距离来计算有效的竞争木，并不是传统意义上的全部竞争木；本研究提出用树冠叠加指数来表示林木与周围树木的树冠竞争情况，并采用等树冠投影面积法把树冠分为5级，这样计算的树冠叠加指数更加与现实林分相符。6、本研究基于乘除法的思想，用多样性混交度、聚集指数、竞争指数和树冠叠加指数构建了天然次生林择伐空间优化模型，设计了10个与林学意义相一致的约束条件，并采用0-1整数规划的思路，在LINGO9.0软件中使用了隐枚举法对目标函数求得最优解。7、以M702标准地为应用实例，具体计算出了每株采伐木，经过择伐后，目标函数值按模型设计的要求发生了极大的改变，增加了5倍多，说明了最后这个解的优良性，满足了设计的要求。

I have been using andrographis for years now, and I have a much lower incidence of winter colds, plus a shorter duration of the colds I have. Planetary Herbals puts out a good quality, affordable, consistent product and I highly recommend it.

我用穿心莲的产品好些年了，几乎很少在冬天有感冒发生，如果感冒了时间也很短，Planetary Herbals带来高品质，负担得起，始终如一的产品，我高度推荐。

Clipping led to increased aboveground biomass and over-compensation in the absence of fertilization, but the degree of compensation depended on intensity, frequency and time of clipping.

不施肥，刈割可促进冷地早熟禾地上生物量的增加并发生超补偿，但补偿程度因刈割强度、刈割频度和刈割时间而异；施肥时，刈割没有或很少促进植株发生超补偿。

I coach people to drive. Last Sunday, I saw a tragedy. Two coaches collided with each other. A building collapsed.Many people clustered to see what happened. Five persons died during the collision. Coherent blood wet their clothes. And thewet cloths clung to their bodies. The police covered the dead with cloaks. A man volunteered to help them. His friendly behavior was a cloak for his evil intentions. A dead wonman clutched her purse tightly but he stole it. Few people noticed his coarse action. Then he wanted to escape from there but tripped over a coil of rope. His clumsy movement attracted the police. According to the clue a witness supplied, he was arrested. At the same time, a coal ship was sailing along the coast clockwise. One of my colleagues happened to be on the ship. His free time never coincided with mine. We only used Morse code to keeo in touch. So I was surprised to see him. What a coincidence!

我辅导人们驾驶上周日我目睹了一场悲剧两辆长途汽车互相碰撞一座建筑倒塌了许多人群集而来看发生什么了事情有5人在碰撞中丧生粘附的血弄湿了他们的衣服并且湿衣服粘住了他们的身体警察用外套盖住死者一个男人自告奋勇帮助他们他友善的举动实际上对邪恶动机的掩盖一名女死者牢牢握住她的钱包但还被他偷走了很少人注意到他的粗鲁行为然后他想逃离那里但被一卷绳索绊倒了他那笨拙的动作引起了警方的注意根据一名证人提供的线索他被捕了与此同时一艘煤船正以顺时针方向驶向海岸我的一个同事碰巧在船上他的闲暇时间从不和我一致我们只用摩尔斯密码保持联系因此我很惊奇地见到他真巧合呀！

The pathogen of gas gangrene mainly exist and live in local place, and seldom enter blood system to cause blood poisoning, but than can form lots of toxins, this toxins can harm blood system, kidney system, and also the tissue can putrescence and the wound will enlarge step by step, all tissue putrescence and toxin can make these bacteria easier to live and reproduce, all these situation if not being control in time will lead a serious situation that multiple organs dysfunction and then died

气性坏疽的病原菌主要在伤口内生长繁殖很少侵入血液循环引起败血症。产气夹膜杆菌产生α毒素、胶原酶透明质酸酶、溶纤维酶和脱氧核糖核酸酶等，红细胞破坏引起溶血血红蛋白尿、尿少、肾组织坏死水肿、液化，肌肉大片坏死使病变迅速扩散、恶化。糖类分解产生大量气体使组织膨胀；蛋白质的分解和明胶的液化，产生硫化氢，使伤口发生恶臭由于局部缺血，血浆渗出，及各种毒素的作用伤口内的组织和肌肉，进一步坏死和腐化，更利于细菌的繁殖使病变更为恶化。

Since historical times,England ,where the early inhabitants were Celts, has been conquered three times .

从有历史以来，英国，在此地早期居住的是凯尔特人，已经被征服了三次。

Bluetooth OBEX File Transfer Enables the sending and receiving of files on your phone via Bluetooth.

蓝牙OBEX文件移动允许经过蓝牙传送和接受文件。。。。