最后一个特性是灵活的数组成员。
在需要数量可变的数组成员时,这个特性很有用。
You may find this useful in cases where you need to have a variable number of array members.
清单9中就像访问数组成员一样访问元素的属性。
In Listing 9, access attributes of an element just as you would elements of an array.
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