These gases would seriously damage the patient's respiratory system.这些毒气会严重损害患者的呼吸系统。Industry has been working at developing harmless substitutes for these gases.该行业一直在努力开发一些可以替代这些气体的无害物质。The problem was that the ex...
指定阅读书目之一是简·奥斯汀的《爱玛》。One of the set books is Jane Austen's Emma.船只必须在指定的港口把捕到的鱼卸下。The vessels will have to land their catch at designated ports.露营被限制在指定的5个野营地。Camping is restricted to five designated campgrounds....