[ U ] a mixture of sand, water, and cement or lime that is used to fix bricks or stones to each other when building walls（砌砖等用的）砂浆，灰浆

[ C ] a large gun with a short, wide barrel (= a part shaped like a tube) that fires bombs or other explosives very high into the air, or an explosive device shot from such a gun迫击炮（弹）

[ C ] a hard, strong bowl in which substances are crushed into a powder by hitting or rubbing them with a pestle (= heavy tool)臼，研钵