名词
中文翻译：Unknown
同义词：
['joining', 'welding']
例句：
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1.The engineer used a special weldingmachine to join the metal parts together.
工程师使用特殊的焊接机器将金属部件连接在一起。
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2. Welding is a skill thatrequires years of practice and training.
焊接是一项需要多年实践和培训的技能。
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3. The welding process involves heating the metal untilit becomes molten and then joining ittogether.
焊接过程涉及加热金属直到它变成熔融状态，然后将其连接在一起。