词汇	free fall trajectory
释义	free fall trajectory 自由降落轨道
随便看	Coal mining subsidence land coal-mining technique coal mining technology coal mining the tunneling coal mining total amount coal mining type coal mining under a river coal mining underbuildings coal mining under buildings coal mining underground coal mining under railway line coal mining under railways coal mining under reservoir Coal mining under river coal mining under sea coal mining under seabed coal mining under surface structure coal-mining under three circumstances coal mining under village coal mining under water-bodies coal mining under water body coal mining under water-containing coal mining under water strata coal mining upon confined water coal mining waste