But all this depend on the steady, safe and highly efficient running of ground source heat pump unit.
但是，这又依赖于热泵机组的稳定、安全、可靠、高效的运行。
The entire building has been equipped with an automatic ventilation system with a highly efficient heat recovery unit.
整个建筑已经装有一个自动通风系统，它有高效的热回收装置。
The entire building has been equipped with an automatic ventilation system with a highly efficient heat recovery unit.
整个建筑已经装有一个自动通风系统，它有高效的热回收装置。
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