介词短语
中文翻译：在
同义词：
['inside', 'on top of', 'within', 'inside of']
例句：
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1. She was in on the secret before anyone else knew.
她事先知道这个秘密。
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2. The new car is on top of the line.
这款新车是最新的。
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3. They were discussing the issue on top of their workloads.
他们在工作负担很重的情况下讨论这个问题。