The solution, across evolutionary time , has been for migrants to northern latitudes to lose skin pigmentation.

These birds migrate northwards in spring and southwards in fall.

这些鸟春天向北迁徙,秋天向南迁徙.

Birds usually migrate from north to south.

鸟类通常由北向南迁徙。

The infected cells then migrate to other areas of the body.

受感染的细胞接着转移到身体的其他部位。

When you migrate an application to the Entity Framework, there are additional considerations that apply.

在将应用程序迁移至实体框架时, 还需要考虑其他一些注意事项.

People often migrate to another country to find work.

人们经常迁往另一个国家去找工作.

Many birds migrate south for the winter.

冬天时,许多鸟类迁徙南方.

Thousands were forced to migrate from rural to urban areas in search of work.

成千上万的人为了寻找工作被迫从农村涌进城市。

The poverty of the soil caused the tribe to migrate.

土壤贫瘠迫使这个部落移居他处.

Many of these birds migrate to our shores during the summer.

每年夏天有许多这种候鸟移栖到我们国家来.

If you have a chance to move to another location, will you migrate or not?

如有机会你会搬家 吗 ?会选择什么样的环境?

Swallows migrate in the winter.

燕子在冬天移徙.

These birds migrate to North Africa in winter.

这些鸟冬天迁徙到北非.

Some birds migrate as season changes.

有些鸟随季节迁徙.

When did Asians begin to migrate to the United States?

亚洲人何时开始向美国移民的?

Do they want to migrate after the Spring Festival?

过完春节以后是否希望继续流动?

Many will migrate remoter places where land is cheaper not crowded with city people.

人将迁往较为偏远的地方,那里土地比较便宜,城市人也不多.

During wet periods Tortoises will migrate from one body of water to another.

在湿时期龟期间从水的一身体将移民到另外的.

The neocytoplasm and the engulfed free nuclei migrate towards the base of the egg.

新细胞质及其包着的游离核迁移到卵的基部.

A small animal, Siegel noted, can't migrate to a warmer climate in winter.

一些小动物, 西格尔指出, 在冬天不能迁移到气候温暖的地方.

Born in the Netherlands, he migrated to Perth in 1951.

出生于荷兰, 他迁移到珀斯于1951年.