氯氟甲烷主要使用在气溶胶喷雾罐和作为冷冻剂.The chlorofluoromethanes are used principally in aerosol spray cans and as refrigerants.在那里, 较冷的空气使冷冻剂冷凝,并在此过程中变热.There, cooler air condenses the refrigerant and becomes heated during the process.氢是...
In Tempe or the dales of Arcady?讲着人,或神,敦陂或阿卡狄?...a remote farm in the Yorkshire dales.位于约克郡山谷的一个偏僻的农场Andand Eighteen Dales is famous for its crooked path and tinkling spring.九溪十八涧则以“曲曲环环路,叮叮咚咚泉”著称.They watched the sun se...
胶卷或感光片应在日食前装入暗盒.The films and plates are put in their holders the night before the eclipse.他用的是照相暗盒, 最原始的相机.He used a camera obscura, which was a primitive camera.这种数字影像暗盒可以取代感光胶片式暗盒,实现记录飞机训练或作战信息的功能.The digital imaging ...