柯林斯词典sealant /ˈsiːlənt/ (sealants) 1. N-MASS A sealant is a substance that is used to seal holes, cracks, or gaps. 密封胶 返回 sealant剑桥词典a substance such as paint or polish that is painted onto a surface to protect it from other liquids going into it, or is put in the space between two materials for the same reason 密封剂；防渗漏剂 返回 sealant