Helicopters can land no matter where a hard level ground exists.

直升飞机可降落在任何平整的硬地面。

youdao

youdao

youdao

I think that's gut-level, hard-wired, evolved to solve prisoner's dilemmas.

这种感觉是根深蒂固的，经过进化而来的，帮我们解决囚徒困境的。

耶鲁公开课 - 心理学导论课程节选

Hence, selfish genes will lead to altruistic animals because, to the extent that evolution operates at the level of the genes, there's no hard and fast distinction between your own body and someone else's body.

所以，自私基因会导致利他行为，从这个意义上说,进化在基因层面进行，你自己的身体和别人的身体,没有严格差别。

耶鲁公开课 - 心理学导论课程节选

One of the reasons it's so hard to assess the level of vegetarianism is because of the multiple definitions of the term.

BBC: The rise of the non-veggie vegetarian

Applicants had to be proven seamen, hard-working and level-headed, with a spotless criminal record (Houston uses private investigators to check up on that).

ECONOMIST: The other Texas

Mr Harrison said the hospital had managed to maintain standards of care but "staff have to work very hard to deliver that level of performance".

BBC: Harrogate hospital plea after rise in patients