词汇	retain roadways along goaf
释义	retain roadways along goaf 沿空留巷
随便看	system of special government allowances system of sperm duct system of sport system of staking system of stalling system of standard system of standard document system of standardization system of stars system of state system of state compensation system of state licences for the manufacture system of statement system of state ownership system of state-ownership system of static equation system of statistical indicators system of statistical report system of statistics system of steel frame-supports system of stock companies System of Stock Market system of straight lines system of strongly elliptic equations system of structural isolation