查询词典 populations

First, the courses and student populations studied in PER and AER are very different.

首先， PER 和 AER 所研究的课程和学生群体差别很大。

According to the population biology theories, genetic diversity of 35 populations of Agropyron mongoliucm Keng distributed over various regions in China was studied.

应用居群生物学原理及方法，对分布于中国不同地区的 35 个蒙古冰草居群的形态学性状进行了分析。

It provides basic data and technical support for Cultivation and Management and seed propagation of Agropyron cristatum in arid region . The results showed as follows:(1)Agropyron cristatum is cross pollinated forage .There were great difference among plants within populations.

研究结果表明：(1)冰草是异花授粉牧草，群体内株间变异较大，根系的生态生活型、种子外稃被毛、叶片表皮被毛等方面存在着丰富的遗传多样性。

Bemisia tabaci Gennadius (Homoptera: Aleyrodidae) is a worldwide agriculturalpest. It is an omnivorous insect which has a very broad host range and complicatedhost-preference biotypes from different populations.

烟粉虱Bemisia tabaci Gennadius隶属同翅目、粉虱科、小粉虱属，其食性杂、寄主范围广，并存在复杂的寄主专化现象，是一种世界性的农业害虫。

Discharge of disinfected wastewater in recipient aquatic systems: fate of allochthonous bacterial and autochthonous protozoa populations.

在本试验条件下得到了标准消毒条件下（温度20°C，消毒时间30min，pH值为7.0）有效氯投量为10mg/L和50mg/L时，峰点前加氯消毒后污水的急性毒性增量（以Zn2+浓度表示）预测公式：y=0.7179x-0.0195，y=2.915x+1.0125（其中y为消毒后污水的急性毒性增量，x为污水的UV254与NH3-N的比值）。

I investigated whether differences in morphology occurred between sympatric and allopatric populations (a precondition for character displacement).

为了解释两物种如何可以共存，探讨共域和非共域地区族群型值是否具有差异(型值置换假说的先决条件)。

Mayr emphasized the importance of allopatric speciation, where geographically isolated sub-populations diverge so far that reproductive isolation occurs.

迈尔强调异域成种的重要性；在地理上孤立的亚群产生的分歧偏离太远，以致出现生殖隔离。

There are four geographic modes of speciation in nature, based on the extent to which speciating populations are geographically isolated from one another: allopatric, peripatric, parapatric, and sympatric.

自然界有四种物种形成的地理学模式，基于形成物种的各群体之间地理隔离的程度分为：异域的、边域性的、领域性的和同域的物种形成。

During allopatric speciation, a population splits into two geographically isolated allopatric populations (for example, by habitat fragmentation due to geographical change such as mountain building or social change such as emigration).

在异域的物种形成中，群体分成两个地理上隔离的异域群体（如因山脉形成等地理变化导致的生境破碎化、移民等造成的社会变化）。

This weed population had a wider niche breadth, the second widest among 12 major weed populations in weed community, and had bigger niche overlap with Stellaria alsine, Alopecurus acquallis, Malachium aquaticum, Poa annua, Polygonum persicaria and Lapsana apogonoides. In rape, wheat or fallow, B.

在杂草群落中，草的生态位宽度居第2位，说明其有潜在的较强的适应环境的能力；草与雀舌草、看麦娘、牛繁缕、早熟禾、春蓼和稻搓菜等杂草种群的生态位重叠较大，与它们的生态要求比较接近。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷