直角坐標系中坐標在 (x,y) 處的單位正方形是 x 與 y 坐標都在單位區間 0 到 1 之內的正方形。
區間究竟是開區間還是閉區間,每個人的判斷會有所不同,在使用時要清楚地進行定義,但是最常用的是閉區間 [0,1]。
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