The boy surrendered the catapult to the teacher.那孩子把弹弓交给了老师.He fitted a pebble into the catapult and pulled back the elastic. Twang!他把石子放进弹弓里，然后往回拉动橡皮筋。“嘣”！The sting of the catapult bullet had worn off.挨的那下弹弓不那么疼啦....
它们叫做构象异构体,也叫做异象体.They are said to be conformational isomers also called conformers.然而 “ 立体异构”一词通常只限于镜象异构.The team'stereoisomerism " however, is generally restricted to mirror image isomerism.异构体被定义为化学式相同而结构不同的化合物.Is...
Amethyst was believed by the Greeks to protect a person from drunkenness.希腊人认为紫水晶可以防止人喝醉。He was arrested for drunkenness on his way to the football ground.他在去足球场的路上因醉酒闹事而被捕。Drunkenness at work was sufficient grounds for ...