1. 衬套接头：jackdrill 凿岩机 | jacket collar 衬套接头 | jacket cooling 水套冷却
2. 领头：jackeroo 新手 | jacket collar 领头 | jacket 夹克
1. jacket collar的意思
1. He also shows other parts of the jacket with leather stripes - inside the pockets and the reverse side of the collar.