The physical properties of rubber accelerator 2 - mercapto benzothiazole and main methods for its preparation are introduced.介绍橡胶硫化促进剂 2- 巯基苯并噻唑的物理性质和主要的制备方法....
And what is that pearl of wisdom supposed to mean?那番精辟见解到底是什么意思呢？They are supposed to be here at about half four.他们应该在4点半左右到达这里。"Is she supposed to work today?" — "Nope, tomorrow."“今天她上班吗？”——“不，明天上。”...
Frances invited them to occupy the upstairs of her home.弗朗西丝邀请他们住在她家的楼上。They huffed and puffed as they carried the sofa upstairs.他们把沙发抬上楼时气喘吁吁。I'll take my coat upstairs. Shall I take yours, Roberta?...我要把我的外套拿到楼上去。...