Gate keeps closely movement with gate when opening and closing, makes valve open and close stability and cuts off the media, and so on.
在关闭和开启过程中阀座跟闸板一直紧贴运动，使得阀门启闭力稳定，并且具有切断介质等特点。
Opening-closing is a basic form of the Earth's movement and opening-closing tectonics is a basic tectonics in geological evolution.
开合运动是地球运动的基本形式，开合构造是地质演化的基本构造。
The left and the right supporting arms can engage with each other through external teeth in order to realize the movement of opening and closing.
左支臂和右支臂可通过外齿咬合使其实现展开或闭合的动作。
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