我计划在这里呆到钱用完为止。
而previous参数之后会被此函数的结果替代，并且这个过程还会针对数组的下一个元素重复，直到所有元素都用完为止。
The previous parameter is replaced by the result of the function, and this process is repeated with the next element in the array until all of the elements are used.
然后这项方法会在延迟定义的间隔时间内进行重复，直到时间用完，或者已经过了确认点为止，如代码清单 6 所示。
These methods then repeat the test at the interval defined by the delay until either time runs out or the verification point passes, as shown in Listing 6.
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