An array subscript is not valid because it falls outside the allowable range 数组下标无效,因为它不在允许的范围内。
Since array subscripts start at 0 , the lowest available subscript for every dimension is always 0 由于数组下标从0开始,因此每一维度最小可用的下标总是为0 。
Since array subscripts start at 0 , the length of a dimension is greater by one than the highest available subscript for that dimension 由于数组下标从0开始,因此维度的长度比该维度最大的可用下标大1 。
Of course , in known contexts such as array subscripts , the compiler is free to optimize away the actual construction of sublists where that ' s unnecessary 当然,在像数组下标这样的已知上下文中,编译器会优化掉实际不必要的子列表结构。