There is no point wasting your energy on a project that will have no value for end users, so start by weeding out bad ideas.
——将时间精力浪费在一个没有价值的项目上是很糟糕的事情，所以务必在一开始就把这些坏可能给去除。
2
The compressed air system still need to stand in the overall energy-saving system energy saving point of view, more attention to end the gas equipment.
压缩空气系统的整体节能还需要站在系统节能的角度，更多地关注末端用气设备。
3
Kinetic energy of rigid body which is indicated by means of speed of endpoint is studied and its application in mechanics is given.