She outdid all her classmates.她超过她的所有同班同学.We outdid our competitors by offering a better product at a lower price than theirs.我们以更低的价格提供更多的产品而战胜了竞争对手.She outdid him in mathematics.她数学比他强....
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...