查询词典 populations

Six populations of Xiphinema elongatum and one population of X. insigne, new recorded species in Kinmen, were isolated from the rhizosphere of pine, persimmon, guava, litchi, sweet orange, sugar apple and loquat from 2001 to 2003. One population of Xiphinema sp.

自2001至2003年问，由金门岛地区的松树、柿子、番石榴荔枝、甜橙及番荔枝等的根圈土壤中分离鉴定6群Xiphinema elongatum ，在枇杷上则发现1群 Xiphinsigne，而此二种剑线虫都是该地区的新记录种。

In order to feed sharply increased populations, agriculture should intensive, this will consectively increase the usage of agrochemical.

为了养活迅速增长的人口，农业必须集约化，这就会不断增加农用化学品的用量。

Hybrid zones are regions where diverged populations meet and interbreed.

杂交区是歧化了的群体接触和杂交的区域。

A physical or biological factor that limits the migration, interbreeding, or free movement of individuals or populations.

障碍物理或生物因素，可以限制迁移、杂交或个体及群体的自由运动

A physical or biological factor that limits the migration ,interbreeding,or free movement of individuals or populations.

障碍物理或生物因素，可以限制迁移、杂交或个体及群体的自由运动这种人口的双向流动是"自由迁徙"的标志。

"A physical or biological factor that limits the migration, interbreeding, or free movement of individuals or populations."

物理或生物因素，可以限制迁移、杂交或个体及群体的自由运动。

Gene flow describes he movement of genes among populations through interbreeding, dispersal and migration.

基因流描述的是基因在种群内通过相互杂交，扩散和迁移进行的运动。

This concept views species as a group of interbreeding natural populations that are reproductively isolated from other such groups.

生物种概念认为种是一组可以相互杂交的自然种群，它们与其他种群间具有繁殖隔离。

Ecology A physical or biological factor that limits the migration, interbreeding, or free movement of individuals or populations.

障碍：物理或生物因素，可以限制迁移，杂交或个体及群体的自由运动 4。

The calculation results show that the populations between the two states are Rabi oscillation in the absence of the rf field, square-wave oscillations in the presence of the slow rf field, and stair steps oscillations in the presence of the intermediate rf field.

计算结果表明：当调频场的频率比较低时，从一个态到另一个态的跃迁几率随时间演化为方波振荡；当调频场为中频时，跃迁几率为阶梯型振荡；在高频调频场中出现调频场的多光子共振。

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％。