名词
中文翻译：交流直流焊机
同义词：
['DC welding machine', 'AC welding machine']
例句：
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1.The AC-dc welding machine is used for welding steel pipes together.
交流直流焊机用于焊接钢管。
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2. The AC-dc welding machine has a high power output and can quickly weld large pieces of metal.
交流直流焊机功率输出高，可以快速焊接大块金属。
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3. The AC-dc welding machine is essential for construction projects that require precise welding.
交流直流焊机对于需要精确焊接的建筑项目至关重要。