名词
中文翻译：知道
同义词：
['understanding', 'aware', 'conscious', 'comprehend', 'realize']
例句：
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1. She knew the answer to the question before she asked it.
她在问问题之前就知道答案了。
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2. He didn't know how to fix the car until he consulted a mechanic.
他直到咨询了一位机械师才知道如何修理汽车。
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3.The teacher explained the concept of gravity to the students in class.
老师在课堂上向学生们解释了重力的概念。