The south side receives large amounts of sunlight and warmth, while the 'subterranean' part of the house contains cold air.

别墅南边可以吸收大量的阳光而变得温暖，而房子的“地下”部分包含着冷空气。

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Soil bacteria and fungi are particularly proficient at producing natural chemical weapons, apparently as part of a subterranean arms race to spew out toxic chemicals to kill rival species.

FORBES: A Dirty Business