原因自然保护的关注在系统使用低品位热源的工作(热能的土壤、空气、放电和排水)。
For the reasons of nature conservation great attention is paid at the systems that use low-grade heat sources in their work (that is heat energy of soils, air, discharge and drain).
他们利用土壤的自然排水能力回水到地面。
They utilize the natural draining ability of soil to return water to the ground.
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