四个坏球就允许击球员自由上垒。
To go to first base after the pitcher has thrown four balls.
击球员无失误安全上垒的击球叫安打，击球员在投手投出四个坏球后可自动上垒。
No mistakes hitter batting called security barrier hits hit the players in the pitcher threw four balls after automatic base.
击球员无失误安全上垒的击球叫安打，击球员在投手投出四个坏球后可自动上垒。
No mistakes hitter batting called security barrier hits hit the players in the pitcher threw four balls after automatic base.
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