一个气泡就是一个静水力场，其中充满了供城市居民呼吸的空气。
The bubbles are hydrostatic force-fields that contain breathable atmospheres for the city's inhabitants.
我们呼吸的空气不按体积来卖，从山中小溪涌流出清澈的水源也是供我们免费来饮的。
The air we breathe is not sold by the cubic foot. The water which flows crystal clear from the mountain stream is free for the taking.
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