troughn.水槽;马槽;低谷;低潮
trough compass长盒磁针
trough washery槽洗
troughing belt运输槽
trough of belt带槽
trough surface向斜槽面
trough casting中间罐浇铸,中间包浇铸
trough conveyer槽形运输机,槽式运输机
troughing rolls槽形输送带滚子
trough blowouts槽形风蚀坑
troughed roller槽形滚柱