1·The last known case was in Britain in 1978 when a university photographer who worked above a lab handling smallpox died after being accidentally exposed to it from the building's air duct system.
众所周知的世上最后一例天花发生在1978年的英国。 那是一个（无辜的）大学摄影师，当时他正在天花实验室的楼上房间里工作，死于接触到大楼的风道系统偶然带出来的天花病毒。 （译者注：这位摄影师也太冤了。）
2·Fan, pump, air duct, water pipe, vent.
风机，水泵，风道，水管，风口。
3·Install relay carrier diagnostic socket and air duct.
安装继电器托架、诊断插座和风道。
4·This product is made up of five parts: boiler main body, smoke air duct, dust collector, pipe system.
本产品出厂时由五大部分组成：锅炉主体、烟风道、除尘器、管路系统。
5·The damper configuration on inlet air duct to coal mills in pressurized direct pulverizing coal systems is analyzed and the optimized design schemes are presented.
分析正压直吹式制粉系统磨煤机进口风道的风门配置，得出最优化风门配置方案。