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几何证题中,许多时候,没有辅助线是不能或者说难以证明出来的,单单的一条辅助线,尤如一座桥梁,可让我们跨越思维的障碍,
Many times, there is no auxiliary line that can not or can not be proved. A single auxiliary line, like a bridge, can allow us to overcome the obstacles of thinking.