乒乓开关

The toggle is called a netsuke.

这个乒乓开关称为根付。

Usually,in the Street,it can be heared a loud and reverberant noise of opening or closing the desk continuous as well as the the sound of reading from children when the class began .

平时，刚开始上课的时候，在街上就能听到课桌开开关关的乒乓声和孩子们一遍遍高声念课文的读书声。

This paper is based on the pingpong bridge field ground protection ,itpresents one point to ground protection scheme which include the self-checking method of switches.

本文针对乒乓式保护，结合开关自检方法提出了完整的一点接地保护方案：在两点接地保护方案中估算了开关切换过程中过渡电阻变化对接地点位置计算的影响，提出了故障位置偏差式两点接地的自适应判据，为了弥补该判据的缺陷，提出了结合二次谐波辅助判据的综合方案。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。