Furthermore, the resulting integer should be checked to verify the value falls within an expected range of values.

此外，还应检查结果整数，以验证该值是否在预期的值范围内。

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The resulting value must be a nonnegative integer less than the sequence's length, and the sequence is asked to assign the assigned object to its item with that index.

最后的值必须是一个小于该序列长度的非负整数，然后该序列就被请求将被赋对象赋值给它带那个指标的项。

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