名词
中文翻译：Unknown
同义词：
['felling hole', 'welding hole']
例句：
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1. The car was fixed with a fettling hole in the engine.
这辆车在发动机上有一个焊接孔。
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2. He had to remove the fettling hole before he could fix the car.
他必须先去掉焊接孔才能修好车。
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3. The welding process requires careful attention to the fettling hole to avoid any leaks.
焊接过程需要仔细关注焊接孔，以避免任何泄漏。