The exception is thrown by the explicit cast because the test case is trying to convert something of type String to an Integer.

这个异常是由显式类型转换抛出的，因为测试用例试图把类型为 String 的东西转换成 Integer。

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The third element of the array is the number of points for this assignment type, so I have to invoke the to_s method to convert that integer into a string.

数组第三个元素是该任务类型的分数，所以我必须调用to_s方法，将该整数转换为字符串。

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Tries to convert the string representation of a number in a specified style and culture-specific format to its 16-bit unsigned integer equivalent.

尝试将指定之样式及文化特性专属格式之数字的字串表示，转换为它的16位元不带正负号的整数对应项。

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