The students were all waiting expectantly with grins on their faces.学生都含笑期待着.He grins, delighted at the memory.想到往事，他开心地咧嘴笑了起来。The very few who knew exchanged celestial grins.了解内幕的很少几个人只好招以会心的微笑....
α粒子是从天然放射性蜕变得到的带正电的氦核.Alpha particles are positively charged helium nuclei obtained from natural radioactive decay.粒子 —— 氦核 —— 正通过试管被抛出, 从而在试管中形成人造迷雾.Alpha particles -- helium nuclei -- were being hurled through the tube...
Convector. Fan can be added or removed.对流供热器. 可以添加或去除风扇.When the temperature of the room reaches 20'C, the convector heater cuts out.室内温度达到摄氏二十度时, 空气对流加热器就会自动停止工作....
Wally was laughing fit to burst.沃利快要笑破肚皮了.He carried on telling a joke, laughing his head off.他继续讲笑话，自己笑得前仰后合。When I stepped into her box, Marguerite was laughing uproariously.当我走进包厢的时候, 玛格丽特放声大笑.We all just cracked up l...