名词短语
中文翻译：向下焊接同义词
同义词：
['down-welding', 'downward welding']
例句：
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1. The engineers used downward welding to join the metal plates together.
工程师们使用向下焊接技术将金属板连接在一起。
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2. Downward welding is a complex process that requires precise control of temperature and pressure.
向下焊接是一项复杂的过程，需要精确控制温度和压力。
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3. In this case, downward welding was used to reinforce the structure's integrity.
在这种情况下，向下焊接被用来加固结构的整体性。