在紧固配件时，一定要用扳手牢牢地固定住长直通管接头。

Always make sure you hold the bulkhead fittings securely with a wrench when tightening fittings.

youdao

在紧固配件时，一定要用扳手牢牢地固定住长直通管接头。

Always make sure you hold the bulkhead fittings securely with a wrench when tightening fittings.

youdao