6 篇文章
Following the dolphins in the murky water is extremely challenging.
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Following the dolphins in the murky water is extremely challenging. 在浑浊的水中跟随印度河豚十分困难

but life ahead will be challenging,
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but life ahead will be challenging, 但前方的生存之路仍充满荆棘

Mastering precipitous terrain is always challenging,
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Mastering precipitous terrain is always challenging, 在峭壁上行走固然很难

but finding enough food to survive is so challenging that most animals living here tend to be small
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but finding enough food to survive is so challenging that most animals living here tend to be small 但由于寻找食物是个巨大的挑战 因此很多雨林生物都长得很小巧

This is a challenging time for the bear family.
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This is a challenging time for the bear family. 对于北极熊一家来说 这是一个极富挑战性的时刻

But each year over 50,000 demoiselle cranes set out on one of the most challenging migrations on Earth.
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But each year over 50,000 demoiselle cranes set out on one of the most challenging migrations on Earth. 可是 5万多只蓑羽鹤每年都会 进行一场地球上最具挑战性的迁徙

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