back-up plate的用法和样例：
例句
- This article presented a teaching experimental platform on general measurement and selected mating about the roller bearing pretension backup plate.
介绍了一种以滚动轴承预紧垫片综合测量选配为主的教学实验平台。 - This paper presents a welding machine back of the design, namely a welding torch can be synchronized with the mobile pads car.
本文主要介绍了一种自动焊背面成型机的设计，即一种可以实现跟随焊枪同步移动的垫片小车。
