She flicked a crumb off the corner of her mouth.她擦掉嘴角的面包屑。She sighed and flicked a dishcloth at the counter.她叹了一口气,然后用洗碗布轻掸着柜台。Alan stretched out his hand and flicked the letter away.艾伦伸手把信拂开了。...
我不知道如何使用同温层观察镜。I don't know how to use the stratoscope.关于同温层中的粒子这一问题将另行讨论.The subject of stratospheric particles will be discussed separately.两类物质分别在同温层和对流层氧化降解.Chlorofluorocarbons and hydrochloroflorocarbons are ox...