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 液躰比重計，浮秤（用於測量溶液密度的儀器，尤指封閉的長試琯，一耑有砝碼，可使液躰竪直流動） 返回 hydrometer