劍橋詞典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 液體比重計(jì)，浮秤（用于測(cè)量溶液密度的儀器，尤指封閉的長(zhǎng)試管，一端有砝碼，可使液體豎直流動(dòng)） 返回 hydrometer