overhead counter shaft

例句：

1. 1. The construction of thebridge required the installation of an overhead countershaft.
   建造这座桥需要安装顶梁柱。
2. 2. The engineer carefully measured the length ofthe overhead counter shaft before starting the project.
   工程师在开始项目之前仔细测量了顶梁柱的长度。
3. 3. The overhead counter shaftis essential for supporting the weight of thebuilding and ensuring its stability.
   顶梁柱对于支撑建筑物的重量和确保其稳定性至关重要。