soft solder flux

例句：

1. 1.The solder flux is essential for the soldering process.
   焊锡膏是焊接过程不可或缺的。
2. 2.The soft solder flux helps to improve the bonding strength between the components.
   软焊剂有助于增强组件之间的粘接强度。
3. 3. The use of soft solder flux can reduce the risk of fire during the soldering process.
   使用软焊剂可以减少焊接过程中发生火灾的风险。