Wild waterfowl are considered the natural reservoir of all influenza A viruses.野生水鸟是A型流感病毒的天然宿主.Computer systems throughout the country are being affected by a series of mysterious rogue programs, known as viruses...全国的计...
Wear well-fitting, lace-up shoes with soft uppers.穿合脚的、系带的软帮鞋。She was taking uppers and downers at the time.她那时在服用兴奋剂和抑制剂。...people crazy on alcohol and cocaine and uppers and downers...酗酒、吸食可卡因、兴奋剂及镇静剂的人Leather uppers a...