The phone was perched precariously on the window ledge.电话放在窗台上,摇摇欲坠.His feet found the window - ledge.他的双脚触到了窗台.He balanced precariously on the narrow window - ledge.他在狭窄的窗台上很难保持平衡....
They watched the dodgem cars bang and bounce.他们看着那些碰碰车互相碰撞并弹开。It was good to bounce ideas off another mind.与别人谈谈自己的想法是有益的。His body lacks the bounce and vigour of a normal two-year-old...他缺乏一个正常两岁儿童应具备的弹跳力与活力。Let's b...
METHODS: The target compound was prepared by the bromination and amination reaction.方法: 用溴代及胺化反应合成了四甲基吡嗪衍生物.The effects of triacetoneamine concentration on hydrogenation and amination were discussed.论述了三丙酮胺纯度对加氢和还原胺化反应的影...
She was addicted to barbiturates.她对巴比妥酸盐产生了依赖性。Barbiturates are used for their calming, sedative effects.巴比妥酸盐类具有镇静 、 安神作用.Barbiturates, bromides, tranquilizers and antidepressants.巴比妥酸盐 、 溴化物 、 镇静剂和抗抑郁剂....
Lead was one of the metals known to the ancient world.铅是早在古代就已知的金属之一。Metals expand when they are heated.金属受热会膨胀。What spurred them on was alchemy, the'science " of changing ordinary metals into gold.激励他们的是炼金术, 即把普通金属...