臭氧是一种非常活跃的氧气形态。Ozone is a highly reactive form of oxygen gas.臭氧由氧气和紫外线发生反应而产生。Ozone is produced by the reaction between oxygen and ultra-violet light.每年春天,臭氧遭到破坏,空洞就出现了。Every spring the ozone is chewed up, and the hole a...
在这方面, 广告增进了交易人之间的信息交流,由此加强了市场竞争的力量.In this way, advertising enhances information flows between traders and thereby strengthens competitive market forces....