名词
中文翻译：严肃性
同义词：
['seriousness', 'seriousness of', 'seriousness degree']
例句：
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1. The student was very serious about his studies.
这个学生对他的学习非常认真。
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2.The situation was serious enough to warrant immediate action.
情况非常严重，需要立即采取行动。
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3.The seriousness of the situation required immediate attention.
情况的严重性要求我们立即关注。