Blood vessels in the head tighten to stop the loss of body heat and then relax to let blood flow rise; that sudden rush of blood is what causes the headache.

头部的血管收紧以阻止身体热量的流失，然后放松让血液流动起来，血液的突然涌入是引起头痛的原因。

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Look up at your hands. Hold for 20 seconds, then relax.

抬头看手，保持20秒钟，然后放松。

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PICK ONE CHALLENGE, GIVE IT 100 PERCENT, THEN RELAX.

找出一件具有挑战性的事情，付出百分之百的努力然后彻底松放。

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train helps me relax, and then I can, you know, read a book or whatever, so.

火车让我放松下来，然后我可以，你知道，看点书什么的。

利用大众交通工具吧 - SpeakingMax英语口语达人

And after setting it up, you can then relax and recommend grants to qualified charities over time.

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Hold the contraction for five seconds, then relax for five seconds.

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However, if on occasion your doctor makes you wait, then relax.

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