的布查德花园(butchart gardens),就在花园的对面是蝴蝶园(butterfly
(butterfly theorem)蝴蝶定理
蝴蝶定理(butterfly theorem)设m为圆内弦pq的中点,过m作弦ab和cd.
butterfly 蝴蝶模式b点最可靠的是xa段的0.
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