And a touch of nervous anticipation can actually help you get revved and keep you at peak performance while you're taking the test.

其实，适当的紧张感能够帮你在考试时保持一个巅峰状态。

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For example, birds clap their wings together at the peak of the upstroke during takeoff - that's the clatter of a pigeon taking off in the park - and rotate their wings on the way down to get lift.

例如，鸟儿在起飞上升的顶点合起它们的翅膀——这是公园里鸽子起飞时扑哧的声音——在降落时旋转它们的翅膀以获得升力。

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For example, birds clap their wings together at the peak of the upstroke during takeoff - that's the clatter of a pigeon taking off in the park - and rotate their wings on the way down to get lift.

例如，鸟儿在起飞上升的顶点合起它们的翅膀——这是公园里鸽子起飞时扑哧的声音——在降落时旋转它们的翅膀以获得升力。

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