Because tally is a local variable within the function, it is created anew with each call and falls out of scope and is destroyed automatically when each call returns.

由于tally是函数内的本地变量，它将在每次调用时重新创建并清空范围，并且在每个调用被返回时自动销毁。

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Also new is Sports Scoring, a function that lets the user record a running tally of the score for a sporting event by simply tapping on a smartphone.

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