一年生的

Flooding,as a kind of disturbance events,occurred with higher and higherfrequency over the world.To investigate the effects of flooding disturbance ongrassland vegetation and the soil,a comparatively thorough study was conducted onAneurolepidium chinense grassland in Songnen plain,Northeast China.The studysite was located in Sanjiadian National Rangeland in the territory of Da'an city,Jilirprovince,which was partly flooded in 1998.On the study site,Several transectssubjected to different flooding durations and intensities were designed for thecomparative study among them on such aspects as vegetation characteristics,seedbanks,vegetative propagation of rhizomatous plants,distribution patterns ofpopulations,interspecific relations,and physio-chemical properties of soil.Theresults were as follows:(1)Of the functional group composition of the vegetation,with the elongation of the flooding duration or the increase of flooding severity,theratio of hygric and hygro-mesic plants increase,while that of mesic and mesoxericplants decrease,of Therophytes changed unimodally,of Geophytes increased,whileof Hemicryptophytes decreased.

为弄清草地植被及其土壤环境对水淹干扰的响应，在松嫩平原羊草草地1998年部分遭受水淹的吉林省大安市三家甸子草场内设置了经历不同水淹干扰持续时间和不同水淹强度的样带，并在这些样带之间从植被特征、种子库特征、根茎植物的营养繁殖性能、种群分布格局、种间关系及土壤的理化性质等多个方面展开对比研究，主要结果如下：(1)在植被的功能群组成中，随干扰强度的增加和水淹干扰持续时间的延长，湿生、湿中生类植物功能群的优势度比例基本上是逐渐增加的，中生、中旱生类植物功能群的优势度比例则逐渐减小，而一年生植物的优势度比例呈单峰型变化，地下芽植物比例增加，地面芽植物比例减小。

Bamboo first crystallizes then lignifies during bamboo shoot growth and basically forms crystal structure in one month. 1-year-old bamboo culm ends growth and its height,thickness, volume almost change little, but culm tissue is small and tender and there is more water and less substance in it. Bamboo crystal proportion keeps invariable during this period.2-year-old bamboo culm begin to lignify,its cellulose proportion debases and its crystal proportion decreases. Bamboo lignin debases, crystal proportion changes a little in the end of this period.Many-old-year bamboo culm crystal proportion is almost invariable. Freaky bamboo cell wall crystal region's thickness is less than normal bamboo's. Bamboo cross section crystal area and the ratio of long axis to short axis are less than normal bamboo's,and roundness,irregular index, the fiber cap density per unit area increase more than normal bamboo's.

竹笋生长阶段是先结晶后木素化的过程，一个月内细胞壁结晶组织基本形成；2）一年生竹材的植株秆茎生长结束，秆茎的高度、粗度和体积变化不大，但秆茎的组织幼嫩，含水量高，干物质少，竹材结晶度基本不变；3）二年生竹材的植株开始木质化，纤维素比例降低，结晶度减少，到后期竹子木质化降低，竹材结晶度变化不大；4）多年生竹材的结晶度没有太大的变化，结晶度大小处于波动状态；5）畸形竹材纤维帽细胞壁结晶区的厚度比正常竹小，其横截面结晶区的面积、纤维帽长轴与短轴比有所减少，而圆形度、异型指数有所加大，单位面积纤维帽的密度增大。

The total biomass of ephemeral macroalgae differed considerably among different types of substrata.

试验结果表明不同类型底质上的一年藻类的总生物量变化显著；在固定底质上生长的一年生藻类的生物量显著的高于附着于大型多年生藻类上的。

Some annuals with good scents are sweet alyssum, the large flowering tobacco "Nicotiana Sylvestris", the Regal Lily, which flaunts clusters of trumpet-shaped white flowers, and velvety purple heliotrope.

一些具有宜人香味的一年生植物包括香雪球，大花瓣的烟叶&Nicotiana Sylvestris&，华丽的茉莉（耀眼的成束地开着白色的喇叭状的花朵）和天鹅绒般柔软的紫色的天芥菜花。

DNA C-value is of practical value in the forecast of the invasiveness of exotic species. However, such predictions must be made with comparisons within families because the DNA C-values vary greatly between woody and herbaceous species, between monocots and dicots, between annuals and perennials, and especially among families.

DNA C-值在预测外来物种的入侵性方面具有一定的应用价值，但是，由于在木本植物和草本植物之间、单子叶与双子叶植物之间、一年生和多年生植物之间，特别是在不同的科之间，植物的DNA C-值较明显的差异，因此，根据DNA C-值预测外来物种的入侵性，应该严格地限于同一科内的相关物种间的比较。

Old World annual having heart-shaped leaves and large seeds with short grayish lint removed with difficulty; considered an ancestor of modern short-staple cottons.

东半球一年生植物，有心形的叶子和大的种子，有不容易去掉的短的浅灰色的象软麻布似的东西；被认为是现在大宗生产的棉花的祖先。

To endow with wealth.Old World annual having heart-shaped leaves and large seeds with short grayish lint removed with difficulty; considered an ancestor of modern short-staple cottons.

东半球一年生植物，有心形的叶子和大的种子，有不容易去掉的短的浅灰色的象软麻布似的东西；被认为是现在大宗生产的棉花的祖先。

A light yellow brown.Old World annual having heart-shaped leaves and large seeds with short grayish lint removed with difficulty; considered an ancestor of modern short-staple cottons.

东半球一年生植物，有心形的叶子和大的种子，有不容易去掉的短的浅灰色的象软麻布似的东西；被认为是现在大宗生产的棉花的祖先。

Objective To investigate the effects of interleukin-1 β converting enzyme gene on the biologic characteristics of ovarian cancer cells.

目的 探讨白细胞介素-1 β转换酶的表达，对卵巢癌细胞生物学特性的影响。

Campylobacter: This illness is the most commonly identified cause of diarrheal illness in the world.

弯曲：这种病是最常见的原因查明腹泻病，在世界上。