7."It derives its name from the four bases, spaced 27.43 meters apart on the inner playing field ( the diamond). Cowhide-covered hard balls, wooden bats, and padded gloves constitute the basic equipment."
该运动因其4个垒而得名。4个垒位于内场，相距27．43米。棒球表面用
牛皮缝合，加上木制球棒，加衬手套，构成棒球基本装备。
