It may seem like magic to grow a plant in a completely sealed environment, but the science behind a terrarium is relatively simple. Two primary principles are at work in a terrarium: photosynthesis and transpiration. First, set up the terrarium properly. Most terrariums contain small rocks for water to drain through, some substances to help keep the air clean, soil, a plant, and a small amount of water. These are placed inside the glass container, which is then closed.
在完全密封的环境中种植植物看起来仿佛是一种魔法，但生态瓶背后的科学原理其实相当简单。生态瓶中主要运作的两项原理是：光合作用与蒸散作用。首先，要正确地设置生态瓶。大多数生态瓶内会放入利于排水的小石子、一些有助于空气净化的材料、土壤、一株植物，还有少量水分。这些元素被放入玻璃容器后密封起来。
生活必备字词：
primary a. 主要的
be at work 起作用；产生影响
properly adv. 正确地；适当地
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本文节录自《常春藤生活英语》杂志，完整内容请见十月号。
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