1. Unclamp. One time a serie of ten is much less work than 10 times a single!
一时间，意甲的10要少得多的工作超过10倍，一个单一的！
youdao
2. Join, must both hands hold pipes and pipe fittings tight, keep enough cooling time, cool back hand can unclamp to certain extent, continue and install the next pipe.
3. Join, must both hands hold pipes and pipe fittings tight, keep enough cooling time, cool back hand can unclamp to certain extent, continue and install the next pipe.
