In the middle of the yard was a water pump where the four little girls pumped water for cooking, cleaning and watering the garden.
院中央的是个水泵，小女孩们就在这里泵水用来做饭、打扫卫生、灌溉花园。
The second class absorption heat pump can get hot water or vapour using heat potential difference of middle temperature exhaust gas and lower temperature sink.
第二类热泵可利用中间温度的废热与低温热源之间的热势差，制取热量少但温度高于中温废热的热水或蒸汽。
In the middle of the yard was a water 3 pump where the four little girls pumped water for cooking, cleaning and watering the garden.
院中央的是个水泵，小女孩们就在这里泵水用来做饭、打扫卫生、灌溉花园。
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