Extrapolating from his field results, Salisbury calculated the amount of calories one could extract from a square meter of ultradensely planted wheat sown, say, on enclosed lunar base.

• 通过推算自己的试验结果，他算出了，比如，在一个封闭的月球基地中，平均每一平方米超密集播种的小麦到底能产出多少卡路里。