As the distance between their breeding grounds and their food grows, entire colonies could be wiped out.

随着它们的繁殖地和觅食地之间的距离越来越远，整个群落都可能会灭绝。

youdao

The people who work at the breeding center stay out of sight.

在繁育中心工作的人都不能出现。

youdao

Those he uses have had some of their genes knocked out to stop them breeding in humans.

凯普使用的寄生虫有个特点，即寄生虫的基因被改性以避免它在人体上进行繁殖。

youdao

But elsewhere farming and, therefore, settled life was impossible in the steppes, so the nomads scratched out a meagre existence by herding sheep and goats, and breeding horses and camels, living in close-knit tribal groups.

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