The central duct parallels with trachea.
气管和中央腺管并行。
The contamination in the central air conditioning duct system is the one of the principal contamination of the indoor air, it include inhalable particle and microorganism.
中央空调通风系统送风中的污染物是室内空气的主要污染源之一，主要的污染物是可吸入颗粒物和微生物。
In this paper we designed a robot for central air conditioning duct cleaning on the basis of features of central air conditioning in China.
针对目前国内中央空调特点，设计了一种专门用于中央空调管道清扫的机器人。
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