它可以帮助我们保持冷静的头脑和减轻紧张情绪。

It helps to keep a cool head and minimize nervousness.

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减轻紧张的一个好的方法就是在发表演讲前做大量的调研工作，并把你要讲的中心写下来。

A good way to reduce your nervousness is to do plenty of research before the speech and to write down some of the main ideas that you will talk about.

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这项研究论文的作者注意到，练太极可以改善身体功能和生活质量、减轻紧张和焦虑，以致改善睡眠质量。

Research has shown tai chi can improve physical function and quality of life, relieve stress and anxiety and lead to improved sleep quality, the study authors noted.

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