查询词典 difficult point

Selective catalytic oxidation of propane has been a problem from the industrial point ofview because it is less expensive but difficult to functionalize.

丙烷作为重要的小分子烷烃，将其选择氧化制丙烯酸是一条很有前途的路线。

On base of analysis to simulation result, it was point out the main cause making dissimilar metal"s bonding so difficult was metal"s inharmonic plastic deformation. The distribution and changement of stress and strain on interface and in workpieces were analyzed.Making use of experiment and simulation result, main factors that influence welding property of cold pressure welding were discussed.

通过对模拟结果的分析，说明了异种金属冷压焊较同种金属冷压焊困难的原因主要是界面处两种材料的径向和轴向的不协调塑性变形；直观地显示了冷压焊过程中工件内部及界面处的应力应变分布及变化情况。

Table 1 Isoelectric point and molecular weight of specific protein of total difficult-dissoved protein before acid treatment.

索盐酸浸渍蚕卵对解除滞育的作用机理对蚕种生产有。重大作用。在蚕卵滞育发生的条件。

It is difficult to shout whether ……is bad or not in general as it depends extremeccly abundance on the situation of…….moreover, since a manal point of view search

在总体上很难说……是好还得坏，应该它在很大程度上取决于……的形势。然而，就我独立个体而言，我显示……。

At this point, in spite of some conclusion are direct at a certain industry,not suitable for explain general problems consist in multi- industry , But the conclusion has plenitudinous gists at least and is difficult to be false by approved.

就此而言，尽管有些结论是针对某个产业的，并不适合解释存在于多个产业中的普遍性问题，但这一结论至少是有充分依据而且很难证伪的。

All of these are slicking point of difficult employment for the students who received higher vocational education .

这从根本上暴露出职业教育中存在的问题，从中不难看出高职学生就业难问题症结之所在。

The air well drilling is one kind of practice underbalance drilling,compared with other well drilling relatively have one's own advantages improve the speed of drilling,Protect the oil gas from bearing formation,find the oil and gas in time,but require especial equipment,Minimum displacement in the air well drilling is the difficult point,and its key too.

空气钻井是一种实用的欠平衡钻井，与其他钻井比较有自己的优势：提高钻速，保护油气层，及时发现油气，但装备要求高；空气钻井中最小排量的是难点，也是其关键点。

Based on analyzing and summing up the study results on deformation and fracture mechanisms of materials and member under repeated impact load,this paper shows that material defomation is characterized by plastic deformation concentrating on impact point,multi-systemes sliping difficult to perform and strain more unhomogeneous.

本文综合归纳了材料和构件在循环冲击载荷下的变形、断裂规律及机理研究成果，指出材料的变形具有多系滑移难于进行、应变不均匀性大和塑性变形集中在冲击接触点的特点；材料断裂过程为裂纹萌生、扩展和最后断裂过程，组织及实验条件对材料断裂有较大影响。

Any given oil well has a finite supply of oil, and the wells' production follows the shape of a bell curve. Extracting oil is cheap and easy on the curve's upslope but after the the well has peaked – the point at which half of the well's oil has been extracted – production becomes more difficult and expensive. The output of the well begins to decline and will never recover; production falls steadily and the cost to extract the oil rises.

由於任何一个油井都只有固定的供应量，因此每个油井的原油产量都会遵循钟型曲线：一开始汲取原油很便宜也很容易，因此曲线是上升的，但当油井的产量到顶之后–也就是油井中的原油存量已被汲取出一半时–原油的生产就会变得愈渐困难且昂贵，油井的输出产量也开始下降，而且再也无法恢复，所以产量也将持续减少、使得生产成本不断增加。

He was a brilliant talker, and when he was arguing some difficult point he had a way of skipping from side to side and whisking his tail which was somehow very persuasive.

他是一个很有才气的演说家，争论问题的时候会有一种跳跃式的方法，经常摇晃着他的尾巴，使他在任何时候都极具说服力。

"Second Life is remarkably easy to work with, and is very popular,"

"第二次生命是显着容易的工作，并且很受欢迎，"

For example, we usually assume that materials are homogeneous and isotropic and free of internal defects or flaws.

为了得到适合有限元分析的模型，我们必须经过如图2所示的简化步骤。