You're working achemical plant, a circulatory, a cooling and a heating system, all these thoughtsare active and are actively operating your body.

你正在运作一个化学工厂，一个循环的制冷供暖系统，所有这些想法是活跃并且积极地运作着你的身体。

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It requires no active cooling system and can be installed anywhere on earth, even an underground vault.

FORBES: UK Parliament Group to Study Thorium Reactors

An "active", or mechanical, cooling system was considered for Herschel in the initial feasibility studies.

BBC: Herschel space telescope finishes mission