Send it to the laundry. Don't dry clean it.把它送到洗衣店去吧, 别干洗.The laser should be operated in a dry, clean and dust - free environment.应在干燥, 洁净的环境下使用激光器.How much do you charge to dry clean this sweater?干洗这件毛衣要多少钱?...
After some initial problems, acetone was successfully produced in quantity.解决了最初的一些问题之后，终于成功地制造出了大量丙酮。One might expect azomethane to have a Y structure similar to that of acetone ( CH 3 ) 2 CO.可以预期偶氮甲烷分子具有和丙酮 ( CH3 ) 2CO...