Buying a new butane soldering torch was a challenge.
购买一台新丁烷焊炬是一个挑战。
In the practical production of equipment such as air conditioner, torch soldering is usually used to weld copper tube.
在空调等设备的生产中，经常采用火焰钎焊工艺来焊接紫铜管。
In the practical production of equipment such as air conditioner, torch soldering is usually used to weld copper tube.
在空调等设备的生产中，经常采用火焰钎焊工艺来焊接紫铜管。
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