甲烷和丙烷是烷烃。Methane and propane are alkanes.丙烷气钢瓶a propane gas cylinder亚胺基杂环丙烷季铵盐的阳离子,一定是按协同反应的方式开环的.The aziridinium ions must all be opened by a concerted process....
My digestion ain't so hot these days, either.我的消化系统这几天也不怎么对劲儿。Gastroenterology: Medical specialty dealing with digestion and the digestive system.消化学: 研究消化系统及其疾病的医学.Wealthy people drank cacao and said it was good fo...
Mexican cookery is economical, she says. Nothing goes to waste.“墨西哥的烹调注重俭省，”她说，“任何东西都不会浪费。”She took me to a Mexican restaurant.她带我去了一家墨西哥餐厅。It was dubbed into Spanish for Mexican audiences.它被译制成西班牙语以方便墨西哥观众观看。...