Generally, the reason for such seasonal back-and-forth movement is to seek resources that aren't available within a single area year-round.

一般来说，进行这种季节性往返迁移是为了寻找在一个地区无法全年获得的资源。

youdao

It continues to haunt us, to stalk us, and as we try to silence it with reason and maturity we find that indeed, it is a fire within our bones and it will not yield.

这种呼唤会一直回荡在我们耳边，缠绕着我们，即使我们试图用理智和成熟去沉默它，我们却发现实事上它是我们内心骨子里的一团火焰，永远不会熄灭。

youdao

Of course, the key phrase is "within reason;" but the realization that I was already retired, that my freedom was not defined by monetary means, was extremely liberating.

当然，关键词是“在理智范围”，但意识到我已经退休，意识到我的自由不是通过金钱定义的，这让我很是舒畅。

youdao

There is no reason why China cannot continue to rise within that highly successful framework.

WSJ: The Rio Tinto Lesson

One reason for the plethora of challengers is that Mr Bercow lacks support within his own party.

ECONOMIST: The campaign in Buckingham

There is good reason to believe that much of the above can be sorted out within the next few years.

CNN: Cash -- or E-Money?