1. heat exchanger with heat pipes 
   热管换热器
2. While advocating family planning, China has mainly focused on contraception.  
   中国实行计划生育坚持以避孕为主。
3. heat source of district heat supply 
   城市集中供热热源
4. heat exchanger of district heat supply network 
   热网换热器
5. heat utilization in district heat supply system 
   城市集中供热应用

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