名词
中文翻译：严肃的
同义词：
['serious', 'solemn', 'grave', 'seriousness']
例句：
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1. The teacher was very serious about the lesson.
老师对这堂课非常认真。
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2. He is a serious person who always keeps his word.
他是一个严肃的人，总是守信用。
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3. The situation was serious enough that we had to call for help immediately.
情况很严重，我们不得不立即求助。