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棒球

棒球是棒球运动所使用个球。球以橡胶或黄柏填满中心，外层皮革需以手工一针一针用毛线缝合。球个直径2.86至2.94英寸（7.3～7.5厘米）、圆周长约9到9.25英寸（22.9～23.5厘米）。

source: https://wuu.wikipedia.org/wiki/%E6%A3%92%E7%90%83%EF%BC%88%E7%90%83%EF%BC%89