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1·We will require wisdom and resoluteness to ensure that migrating species can continue their journeying a while longer.

我们需要智慧和决心，以确保迁徙的物种能够在更长时间里继续它们的旅程。

2·And with certain other migrating species, the challenge is complicated further—by vastly greater distances traversed, more jurisdictions, more borders, more dangers along the way.

对于某些其他的迁徙物种来说，挑战变得更加复杂——因为跨越的距离更大、管辖范围更广、边界更广、沿途的危险也更多。

3·Mediterranean waters, nearly enclosed by land, are a favorite of migrating species looking for food and refuge.

地中海水域，几乎是由陆地，是一个喜爱的迁移物种寻找食物和避难所。

4·And with certain other migrating species, the challenge is complicated further-by vastly greater distances traversed, more jurisdictions, more borders, more dangers along the way.

对于其它某些迁徙物种来说，这种挑战更加复杂——因为一路上它们要穿越更长的距离、更多的行政区、更多的边界，经历更多的危险。

5·North and South American species migrating across the Isthmus now came into competition with each other.

北美和南美的物种迁徙穿过地峡，现在开始互相竞争。

6·Like all good bird-watchers, he records every sighting in a notebook so he can track which species he has not seen before and which birds are migrating.

像所有好的观鸟，他发现记录每一个笔记本电脑，这样他可以追踪的物种，他以前从未见过这些鸟类是迁徙。