retarder
n. [助剂] 缓凝剂；减速器；[化学] 阻滞剂；迟缩剂
例句
The storage time could be prolonged by adding retarder.
加入适量阻聚剂可以延长其保存期。
In order to control its coagulation time, 2% retarder should be added.
为了控制其凝结时间，需加入2%的缓凝剂。
The technology of super concrete retarder is a new research interest in concrete technology.
混凝土超缓凝剂技术是当今混凝土技术的一个新的研究方向。
