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[制冷]回风，循环空气；[建]回流空气
1、tax return───[税收]纳税申报单；n.纳税申报单
2、return visits───回访；复诊；n.复诊( return visit的名词复数 )
3、shareholder return───股东报酬；股东回报
4、air───vt.使通风，晾干；夸耀；n.空气，大气；天空；样子；曲调；vi.通风
5、return───n.返回；恢复；归还；（网球等）回击球；被退回的东西；回路导线；v.返回；（尤指感觉）恢复；把……退回；以……相报；（网球等）回击（球）；adj.来回的；巡回的；报答的；回程的；返回的
6、economic return───经济效益
7、by return───立即回答，立即回复；由下一班邮递带回；由原班回程邮递带回
8、return back───返回
9、financial return───财政收益
1、With a project example, compare the primary return air system with the secondary return air system, especially in design of the AHU.───混合式空调XiTong中一次回风XiTong与二次回风XiTong是两种常见的处理方式，两种方式各有优缺点。
2、Guo and his party also inspected the 412 District, the main fan room, forward, return air inclined installation and construction.───郭海一行还检查了412盘区主扇机房，进、回风斜井的安装和建设情况。
3、My vacation begins next week. I've got a return air ticket to my hometown.───我下周休假，已经买好了回家乡的往返机票。
4、The advance support of intake and return air course needs a lot of plate girders in the comprehensive mechanized coal mining face.───综采工作面的进回风巷超前支护要用很多板梁。
5、Here, return air Tong Xuan than stressed Jianjing point massage is the best side of bath, and massage.───在此，回气堂玄斎先生强调肩井穴的按摩最好是一边沐浴，一边按摩。
6、Our main products are : ceiling diffusers , return air grilles, volume control dampers, duct fittings, fiexibie ducts etc.───公司主要产品有：天花板扩散器，回风格栅，阻尼器，管件，保温管道等。
7、Return air duct section. Single - or double-line ducts can be specified.───回风管道部分。可以指定单线管道或双线管道。
8、This paper analyses that fresh air and return air efet IAQ in air-conditioning system at present.───分析了目前空调XiTong新风和回风对室内空气品质的影响。
1、Return air duct section. Single - or double - line ducts can be specified.
2、An intense field dielectric air filtration system includes a perimeter frame for wall or ceiling mounting at the inlet of a return air duct for an air conditioning apparatus.
3、The Zone Return Air Path Zone Mixer and Zone Return Plenum components comprising the path.
4、This paper proposes a new working face ventilation system: top gas tunnel small pillar outside the bottom return air laneway layout, in other words, which is gas tunnel location evolution.
5、For ￡35 10s 0d he offered a return air fare and a camping holiday in the Corsican sunshine.
6、Airflow from the large cyclone collector inhalation top return air duct blower, this machine is a closed loop system, the air flow, and circulation in the flow of positive and negative state.
7、The clean operating department applies eight unattached clean air conditioning systems, and applies the secondary return air systems with the constant return air rate.
8、Pierce a pump shaft of small section concurrently as return air shaft at lineE47 neighborhood in the north, establish the exhausting fan, become the ventilated way of opposite angle of two wing.
9、The reserved water in the dump bucket obstructs return air in an excrement passage.