ballast的中文意思、音标与词形变化

n. 压载物, 压舱物 [经] 底货, 压舱货

n. any heavy material used to stabilize a ship or airship n. coarse gravel laid to form a bed for streets and railroads n. an attribute that tends to give stability in character and morals; something that steadies the mind or feelings n. an electrical device for starting and regulating fluorescent and discharge lamps