猜单双概率简介：He opened the pink paper crane, and there was a sentence written inside. He read it again and again carefully, then folded the paper crane again and put it into a glass bottle, and collected it very solemnly.
He opened the pink paper crane, and there was a sentence written inside. He read it again and again carefully, then folded the paper crane again and put it into a glass bottle, and collected it very solemnly.
