名词
中文翻译：主焊缝
同义词：
['main weld', 'primary weld']
例句：
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1.The main weld of the bridge is visible through the crack in the road surface.
通过路面上的裂缝，可以看到桥梁的主焊缝。
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2.The main weld of the steel beam was not properly secured during installation.
钢梁的主焊缝在安装时没有妥善固定。
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3. The engineer inspected the main welds on the bridge to ensure they were structurally sound.
工程师检查了桥梁上的主要焊缝，以确保它们结构稳固。