1. A device for flushing toilets and urinals that utilizes pressure from the water supply system rather than the force of gravity to discharge water into the bowl, designed to use less water than conventional flush toilets. 
   冲水阀一种冲洗抽水马桶或便池用的阀门，是一种使用供水系统的压力而非利用重力冲洗马桶的装备，为了比传统冲水马桶节水而设计
2. gravity separation of wastewater 
   废水重力分离处理法
3. hollow gravity arch dam 
   空腹拱坝
4. The law of gravity. 
   地心引力定律
5. gravity field of the Earth 
   地球重力场

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• 1. 重力压
  重力位 gravity pressure...重力压 gravity pressure filling machine...重力装填机 gravity process
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