base girder

• 底梁

base girder的用法和样例：

例句

1. The present invention also provides means vertical movement of the idler wheels as well as means for flexibly urging the idler wheels downwardly with respect to the base beam.
   本发明还设有供惰轮垂直移动的装置和可柔性地驱使惰轮相对于底梁下降的装置。