你们可以利用那些被搁置不用的建筑材料。
You can make use of the building materials that have been lying by.
浮游植物(还有陆生植物)能利用碳水化合物，将其作为“建筑材料”，供生长所需。人类和鱼类也能直接食用植物，以从中得到同样的碳水化合物。
Phytoplankton (and land plants) use carbohydrates as "building blocks" to grow; fish and humans consume plants to get these same carbohydrates.
利用此类蒸汽可能代价不菲，因为这不仅要消耗额外的建筑材料，而且要求所用的建材更为牢固以经受更高的压力和温度。
Tapping this steam would be expensive, since it would require not only extra building materials, but also more durable ones, to cope with the higher pressures and temperatures.
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