词汇	rock drill bit
释义	rock drill bit 岩石钻头
随便看	employment of industry employment of labor employment of labor force employment of migrant workers employment of military strength Employment of Nonagricultural Sectors Employment of operational conditioned reflex employment of peasant labor employment of profit employment of rural labor employment of salvage service employment of starting an undertaking Employment of Student employment of talented people employment of tanks employment of the aged Employment of the disabilities employment of the graduates employment of the handicapped employment of the labor force employment ofthe surplus labor force employment of undergraduate employment of undergraduates employment of university graduates employment of university student