1 [U] a mixture of cement, sand and water used in building for holding bricks and stones together 砂浆，灰浆（水泥、沙和水的混合物，用于砌砖、石） ☞picture at building 见building插图

2 [C] a type of heavy gun that fires a type of bomb high into the air 迫击炮

3 [C] a small heavy bowl used when crushing food, etc into powder with a special object (a pestle) 臼；研钵 ☞picture at laboratory 见laboratory插图