Buying a new butane soldering torch was a challenge.

购买一台新丁烷焊炬是一个挑战。

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Practice shows that the needful iso butane purity has been reduced from 98% to 90% and the new method is characterized by safety, reliability and a stable control.

实践表明，使用该法开工对异丁烷纯度要求可由98%降低到90%，同时具有安全可靠、控制稳定的特点。

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