名词
中文翻译：Unknown
同义词：
['underwater', 'undertaking', 'undertakings']
例句：
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1. The divers are undertaking a deep dive to explore the wreckage.
潜水员正在进行一次深潜，以探索沉船残骸。
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2. The underwater photographer captured stunning images of the coral reef.
水下摄影师拍摄了珊瑚礁的惊人照片。
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3. The undertaking was challenging, but the team persevered through the difficulties.
这项任务很有挑战性，但团队还是坚持了下来。