He did his best to lighten things up.
他尽力使局势生动起来。
要生气He did his best to lighten things up.
他尽力使局势生动起来。
Come on, lighten up! It was only a joke.
喂，别紧张！这只过是开玩笑。
She tried to lighten up her speech with a few jokes.
她讲
几个笑话以使讲话轻松愉快些。
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