Salmon also carry dangerous chemicals as the fish migrate between rivers and the sea.

随着鱼类在海洋之间的迁徙，三文鱼也会携带危险化学品。

Every year, some members of the population migrate between breeding grounds and their overwintering grounds-like parking lots.

每年，乌鸦群中会有一些成员往返于繁殖地和停车场等过冬地之间。

Many families migrate back and forth between the countries, making it hard to vaccinate every single child.

许多家庭在这些国家之间来回搬家，使得很难给每个孩子接种疫苗。

They'll migrate back and forth between feeding and spawning grounds annually for the rest of their lives.

在余下的年岁中，它们会来回往返于觅食区域和产卵地。

Or was it that dinosaurs wouldn't migrate between regions?

还是恐龙不会在地区之间迁徙？

Some sea animals, like jellyfish, comb jellies and salps can migrate between depths partially because their 90% water consistency allows them to withstand immense pressure.

在猎物遁走前抓住它有些海洋动物，比如水母，栉水母，还有樽海鞘可以在不同深度水域中移动部分原因是它们身体有90%的组成是水。

Both of these fliers are 23 times bigger or smaller than you, and both fly intercontinental distances - the tiny bird migrates between Alaska and Mexico!

它们两个都比你大或小23倍，而且都可以洲际飞行——这种小蜂鸟在阿拉斯加和墨西哥之间迁徙!

The world's largest carp, these powerful fish cruise the rivers with the seasons, migrating between spawning grounds in mountain torrents and these more placid lowland waters.

作为世界上最大的鲤鱼，这些大型鱼类随着季节的变化在河流中游弋，在山区激流的产卵地和这些更平静的低地水域之间迁徙。

Fish that migrate between seawater to freshwater, such as salmon that migrate from the seas to the river to spawn, literally change their body to adapt to the freshwater!

在海水和淡水之间洄游的鱼类，比如鲑鱼，从海洋洄游到河流产卵，它们实际上改变了身体的结构来适应淡水！

This was the first human-like species to migrate out of Africa between 1.8 and 1.3 million years ago — and they settled land as far away as Georgia and Indonesia.

这是第一个在 180 万到 130 万年前迁出非洲的类人物种，他们在遥远的格鲁吉亚和印度尼西亚定居下来。

But electrons are tiny and almost insignificant in mass, and rubbing or friction can give loosely bound electrons enough energy to leave their atoms and attach to others, migrating between different surfaces.

但电子很小， 质量几乎微不足道，摩擦或摩擦可以为松散结合的电子提供足够的能量，使其离开原子并附着在其他原子上，在不同表面之间迁移。