某种蟑螂喷射一种催泪性毒气――乙 基丙烯 醛.A species of cockroach sprays a substance , ethylacrolein, that is a kind of tear gas.即丙烯醛水合法, 环氧乙烷甲酰化法,生物发酵法.They are acrylaldehyde hydration, ethylene oxide formylation and biological zymolysis m...
He cycled all day long, till he was fagged out.他骑了一整天自行车, 直到精疲力竭方才罢休.He was completely fagged out , ie exhausted.他完全筋疲力尽了.Jack fagged away at his math.杰克专心费力做数学....
他来到花园门口，挤了进去。He reached the garden gate and thrust his way through it.格雷丝轻轻敲了敲卧室的门，走了进去。Grace tapped on the bedroom door and went in.我会偷偷溜进去，轻手轻脚地查看一下二楼。I would creep in and with stealthy footsteps explore the second-flo...