剑桥词典a piece of equipment used to measure the density (= amount of matter in a particular quantity ) of liquids , especially a long glass tube , closed and with a weight at one end so that it floats vertically 液体比重计，浮秤（用于测量溶液密度的仪器，尤指封闭的长试管，一端有砝码，可使液体竖直流动） 返回 hydrometer