An extraordinary crop circle based on the 'world's most beautiful maths theorem' has appeared in a field next to a windmill in Wiltshire.
一个基于“世界上最美数学定理”的离奇怪圈出现在威尔特郡一架风车旁边的田里。
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Based on shearing stress Theorem, we know that the shearing stress direction of all the spots on the edge of circular cross-section should be tangent to the circle.
由切应力互等定理可知，在截面边缘上各点处切应力方向必与圆周相切。
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This study illustrated that the theorem could be also applied in a case where the sources and sinks are on the circle by means of the regular perturbation method.