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English

In 1926, Oskar Klein proposed that the fourth spatial dimension is curled up in a circle of a very small radius, so that a particle moving a short distance along that axis would return to where it began.

Chinese

在1926年,奧斯卡·克萊因(Oskar Klein)提議了第四個空間維度捲曲成一個半徑非常小的圓,所以粒子沿著這個軸移動很短的距離,就會回到起始點。