What fearful leaders often do in perilous times is nothing. Worried that any action is risky, they sit still.

面临危险时，怯懦的领导人往往无所事事，他们担心任何行动都有风险，因此宁愿什么都不做，但这么做并不见得更安全。

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It is true that during our explorations we often faced difficulties and dangers of the most perilous nature.

确实，我们在探险的过程中，常常遇到最惊心动魄的困难和危险。

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It is true during their explorations they often faced difficulties and dangers of the most perilous nature.

确实在探险中，他们经常面临着各种最有危险性自然界的艰难和险阻。

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Authorities have long warned of the dangers of illegal border crossings, often focusing on perilous desert treks by land.

CNN: Mexico: Traffickers abandoning immigrants at sea

In jump racing of all types, and particularly in steeplechases, the first obstacle is often the most perilous because the horses haven't gotten into rhythm.

WSJ: Why They Fear Aintree's First