bouncing pin apparatus

例句：

1. 1. The bouncing pin apparatus is used to test the stabilityof a bicycle frame.
   弹跳针装置用于测试自行车框架的稳定性。
2. 2. The engineerdesigned the bouncingpin apparatus to detectany defects in the material.
   工程师设计了弹跳针装置来检测材料中的任何缺陷。
3. 3. The bouncing pin apparatus was used to measure the distancebetween two points on the track.
   弹跳针装置被用来测量赛道上两点之间的距离。