英式：[ˈtʃekˌreɪn]美式：[ˈtʃekˌreɪn]
n.勒马缰绳
Checkrein of liquid acidity at the bottom of the methanol tower of the 1,4-butanediol plant 1,4-丁二醇装置甲醇塔底液酸度的控制
