[化] 旋光对映体
n either one of a pair of compounds (crystals or molecules) that are mirror images on each other but are not identical

说一口流利的英语,从简单的单词开始。 听听,读读,背背,今天你的词汇量又增加了5个。 单词/词义 中英例句 单词听读 chocolate [ 5tFCkElit ] I'd like a pie

发表于:2018-12-30 / 阅读(40) / 评论(0) 分类 每日攻克5词

Heavy Rains Bring Raging Floods - and a Debate This spring, so-called 100-year floods swamped many communities along the Mississippi River, America's largest commercial waterway. The flooding was so severe that the U.S. Corps of Engineers, which supe

发表于:2019-01-14 / 阅读(45) / 评论(0) 分类 VOA标准英语2011年(六月)

With the price of gold at all-time highs, a familiar fever is once again sweeping Alaska. Everybody has their own reason why they are into it. Some people, you know, you find what you got and you try at once to find a little bit of gold. This is kind

发表于:2019-01-22 / 阅读(28) / 评论(0) 分类 自然百科2009年

They could not lose. Resistance movements started. They would take over places like this and opened the sluice gate allowing the water to pour back down into Owens Valley. Irregularly they dynamited the aqueduct. But the city rebuilt it and the game

发表于:2019-01-22 / 阅读(50) / 评论(0) 分类 自然百科2010年

He had been upstairs, enjoying the comfort of a featherbed and the warmth of Shae's body beside him, 片刻前,他人还在楼上,躺在柔软舒适的羽毛床上,怀抱雪伊温暖的身体。 when his squire had woken him to say that a rider

发表于:2019-01-30 / 阅读(34) / 评论(0) 分类 冰与火之歌系列之《权力的游戏》

It was already dark, and the beach at Lowell Park was closed for the day. Dutch Reagan, the seventeen-year-old lifeguard, was helping the park manager, Mr. Graybill, close up the changing rooms when they heard muffled cries and splashing. A swimmer h

发表于:2019-02-21 / 阅读(55) / 评论(0) 分类 名人认知系列 Who Was