It is always perilous to neglect our national defense.

忽视国防始终都是危险的。

And the next layer is just as perilous: The photosphere.

而下一层也同样危险：光球。

Together, these developments point to a perilous period ahead.

综合起来，这些发展标明一个危险的将来。

But we are entering really perilous and uncharted waters.

但现在玻利维亚处于危险且未知的局面。

These islands are at a perilous crossroads.

这些岛屿正处于危险的十字路口。

Only philosophers embark on this perilous expedition to the outermost reaches of language and existence.

唯有哲学家才会踏上此一危险的旅程，迈向语言与存在所能达到的顶峰。

A perilous rescue effort is still underway.

危险的救援工作仍在进行中。

Yet it is bold precisely because it is perilous.

然而，这次行动正是因为危险，所以才称得上大胆。

You could replace it with perilous.

你可以用 perilous 来代替。

Moving from tree to tree is a perilous business.

在树间跳跃穿梭十分危险。