As a subject matter expert in sports statistics, I can tell you that in softball, "PO" stands for "Putouts." A putout occurs when a defensive player catches a batted or thrown ball and tags a base to retire a batter or runner. This is a fundamental defensive statistic that measures the number of outs a player is directly responsible for making.

Now, let's translate that into Chinese:

在垒球统计数据中，“PO”代表“出局数”。出局是指防守球员接住击出的球或者传出的球，并触碰垒包以使击球手或跑垒员出局。这是一个基本的防守统计数据，用来衡量球员直接造成的出局数。

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In baseball statistics, a putout (denoted by PO or fly out when appropriate) is given to a defensive player who records an out by one of the following methods: Tagging a runner with the ball when he is not touching a base (a tagout)read more >>