| 短语 | without being aware of | 
| 释义 | without being aware of未曾觉察;未曾留意:Tourists walked on thin ice of a lake without being aware of how dangerous it would be to them if the ice should break.旅游者们在湖上的薄冰上行走而未曾觉察如果冰裂了将多么危险。 | 
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