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English

For example, an ant living on a sphere could measure the sum of the interior angles of a triangle and determine that it was greater than 180 degrees, implying that the space it inhabited had positive curvature.

Chinese

例如,生活在球面上的蚂蚁能够测量三角形的内角和,发现它大于180度,表明这个曲面是正曲率的。