bubble level

• 水准仪

bubble level的用法和样例：

例句

1. Construction workers are measuring distances with a level.
   施工人员正在用水准仪进行测距工作。
2. It is easy to use a water level to measure things, but you need to do many experiments before mastering it.
   水准仪的测量方法很简单，但也需要通过多次的实践才能够掌握。