When an inner function gains and USES access to its outer function's variables it is known as a closure.

当内部函数获得和使用其外部函数的变量时，就称其为一个闭包。

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Of course, other variables, both known (dedicated bagger) and unknown (payment type, coupons, cigarettes) affect on the speed of the line, but this is a good rule of thumb to use as a baseline.

当然，有些变化的因素，诸如知道的因素(专业装袋工)和不知道的因素(结账方式，优惠券，香烟)会影响速度，但是这是一个不错的基础准则。

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He estimated the likelihood that they would marry, using dozens of variables known to predict this, such as race, income and family background.

他使用多个用于预测的变量，如种族、收入和家庭背景，对她们结婚的可能性作出预测。

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