短语
中文翻译：Unknown
同义词：
['all that is known', 'all that is known to me']
例句：
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1. I know nothing about the history of this city.
我对这座城市的历史一无所知。
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2. All one knows is that he was a great man.
只知道他是个伟大的人。
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3. All one knows is that she is a good friend.
只知道她是个好朋友。