定期航班的数量正让空中交通指挥系统不堪重负。The volume of scheduled flights is straining the air traffic control system.他们发行一定数量的可公开交易的股票。They issue a fixed number of shares that trade publicly.有一些廉价的商品，但是数量不足以满足需求。Cheap goods are available, ...
The symptoms include skin rashes, fever, and painful joints.病症包括皮疹、发烧和关节疼痛。Check joints are secure and the wood is sound.检查一下连接处是否稳固及木料是否结实。Expansion joints of various kinds are fitted on gas mains.各种各样的伸缩接头被安装在煤气的总管道上了....
蓝舌病发生于大多数家生的和野生的反刍动物.Bluetongue occurs in most species of ruminants , both domestic and wild.人们对蓝舌病的发病机制还不完全了解.The pathogenesis of bluetongue is inadequately understood.蓝舌病病毒在这种昆虫体内繁殖.The bluetongue virus replicates in t...