This article elaborates the structural feature and operating principle of the high performance stop valve and to introduce the calculative formulas of workingmovement of the globe disk.
阐述了高性能截止阀的结构特点及工作原理，介绍了球形阀瓣工作行程的计算公式。
2
Movement out of city centers was widespread, and downtown tenants were predominantly made up of the working poor.
迁出市中心的现象非常普遍，而市中心的租户主要是由贫穷的劳动者组成。
3
Especially if you don't do much movement while working, it's essential that you get some daily exercise.