a pulley on a shaft that presses against a guide belt to guide or tighten it
双语例句
用作名词 (n.)
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。
The rear idler brace is then attached along with the two small return rollers to complete the suspension assemblies. 后部的诱导轮支架要和两个小滚轮连接，以此完成悬挂安装。
