speed shifting fork shaft

例句：

1. 1.The engineer had to replace the speed shifting fork shaft with a new one.
   工程师不得不用一个新的来替换变速换挡轴。
2. 2. The car's performance was greatly improved after the speed shifting fork shaft was replaced.
   更换了变速换挡轴后，这辆车的性能有了很大提升。
3. 3.The technician carefully inspected the speed shifting fork shaft before installing it back into the engine.
   技师在重新安装之前仔细检查了变速换挡轴。