So, let's say that I take a unitsquare -- -- so, something that goes from zero to one both in x and y directions.
我现在用一个单位正方形——,在x和y方向上都是从0到1变化。
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It's tough to find a window unit that's lighter than 46 pounds-and a machine like that would be able to cool only a fairly small room (150 square feet or less).