词汇	To add the root element
释义	To add the root element. 用于添加根元素。
随便看	gravitational roughing air classifier gravitational sedimentation gravitational segregation gravitational sensor gravitational separation Gravitational separation SHS gravitational separation SHS composite pipes gravitational separator gravitational seperation gravitational seperator gravitational settler gravitational settling gravitational settling velocity gravitational shift gravitational singularities gravitational singularity gravitational slide phenomena gravitational sliding gravitational sliding basin gravitational sliding plate gravitational slingshot gravitational slip gravitational spinning gravitational spreading gravitational stability