The elements of ordinary arrays are indexed by integers, whereas the elements of associative arrays are indexed by names instead of Numbers.
普通数组的元素用整数作为索引，而关联数组的元素用名称作为索引，而不是整数。
Functions can be stored in associative arrays (arrays that are indexed by names rather than Numbers).
函数可以存储于关联数组中(关联数组是这样一类数组：它们按名称而不是数值索引)。
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