形容词
中文翻译：严肃的
同义词：
['serious', '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. She was serious about her work and didn't want to be late.
她对她的工作很认真，不想迟到。
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3. He was serious about his studies and worked hard every day.
他对学习很认真，每天都努力工作。