名词
中文翻译：油井回油孔
同义词：
['oil well return hole', 'oil wellreturn orifice']
例句：
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1. The oil return hole is a crucialpart of the oil extraction process.
油井回油孔是石油开采过程中至关重要的部分。
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2.The engineers carefully drilled the oilreturn hole to ensure maximum oil recovery.
工程师们仔细钻探油井回油孔，以确保最大限度地回收石油。
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3. The oil returnhole was filled with water and sand,making it difficult for the oil to flowback into the well.
油井回油孔被水和沙子填满，使得石油难以回流到井中。