left-hand tool joint

例句：

1. 1. Theengineer used a left-hand tool jointto fix the broken pipe.
   工程师使用左手工具接头来修理破裂的管道。
2. 2. Theconstruction workers were using left-hand tooljoints to build the bridge.
   建筑工人正在使用左手工具接头建造桥梁。
3. 3. Thecarpenter was working on a projectthat required a lot of left-handtool joints.
   木匠在做一个需要大量左手工具接头的项目。