There were a lot of guest houses which were very tatty.有许多小旅馆都又脏又乱。tatty ornaments俗丽的装饰品His friends used to tease him about his tatty clothes.他的朋友过去常常笑话他破旧的衣服....a very tatty old bathrobe.破旧的浴衣They seemed unreal and kind...
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...