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Relationship between root system characteristics and drought resistance of wheat populations in semiarid region.

半干旱地区小麦群体的根系特征与抗旱性的关系。

Objective:To probe into the sex ratio of natural flea populations.

目的：探讨蚤类自然种群的性比。

Here we report the simulation of populations with sexual reproduction, mutation and dispersal.

本期Nature介绍了中性理论的一种新形式，增添了将有性生殖、突变和扩散等因素考虑在内的内容。

Studies of threatened bird species suggest that sexual selection can indeed drive populations to extinction.

对濒危鸟类的研究显示性选择确实能导致群体灭绝。

Sheldrake added the notion of contagion -"morphic resonance"- which causes behaviour patterns to suddenly emerged in whole populations.

麻鸭续蔓延概念"形态共振"，导致行为模式突然出现整个人口。

By using microsatellite markers, the genetic structure of 9 domestic duck populations in East china, including Weishan sheldrake, Chaohu sheldrake, Shaoxing, Gaoyou, Dayu, Jinding, Liancheng white, Putian black and San sheldrake, was analyzed in this experiment.

本实验通过微卫星标记技术对我国华东地区9个家鸭资源群体（微山麻鸭、巢湖麻鸭、绍兴鸭、高邮鸭、大余鸭、金定鸭、连城白鸭、莆田黑鸭、山麻鸭）的遗传结构进行了评估。

Migrating shorebird populations: by remaining longer in Delaware, the birds will be able to eat enough crab eggs to allow them to complete their migration.

因为蟹子子孙孙在D上前仆后继，所以即使它们的数量下降也不会影响鸟的数量，有足够的蛋供鸟完成迁徙。

This decline, however, poses no serious threat to the migrating shorebird populations: by remaining longer in Delaware, the birds will be able to eat enough crab eggs to allow them to complete their migration.

但是这个减少不会对海鸟的生存造成威胁：海鸟可以在D停留较长时间以找到足够的蟹卵让他们完成迁徙。

In Warsaw the Museum of the History of Polish Jews is not scheduled to open until 2012, but already more than 800 Web users from all over the world have registered with the museum's Virtual Shtetl project to help build a collection of more than 30,000 photographs, videos and audio recordings related to life in 1,300 towns with Jewish populations before and after World War II.

华沙的「波兰犹太历史博物馆」预定2012年才会揭幕，但是全球至少已有800个网路用户登记参与博物馆的「虚拟犹太小镇」计画，协助博物馆将二次大战前后，与1300个犹太城镇生活相关的3万余件照片、录影、录音纳入馆藏。

Variant hemoglobins (see sickle-cell anemia; hemoglobinopathy) can be used to trace past human migrations and to study genetic relationships among populations.

异常的血红蛋白有助于追溯人类过去的迁移情况，并有助于对人群中遗传关系的研究。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。