Owing to the fact that the vertical one-pipe-series-loop heating system for existing house in China is not closed loop system,the metered heating can be realized only by heat cost allocator.是什么意思_Owing to the fact that the vertical one-pipe-series-loop heating system for existing house in China is not closed loop system,the metered heating can be realized only by heat cost allocator.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句