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。

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.

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艾美一路上聊得很开心，因为她的心在歌唱，而汤姆的舌头却不听使唤了。

Amy chatted happily along, as they walked, for her heart was singing, but Tom's tongue had lost its function.

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然而，盲目的信仰也有它的局限，因为如果我们仅仅把注意力放在对将来的设想上，我们会对一路上的机会视而不见。

However, blind faith has its limitations. Because if we just focus on how we want the future to be, we may be blind to opportunities along the way.

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