指定是否按键顺序访问集合成员。
Specifies if members of a collection are accessed in Key order.
以整数索引启用对集合成员的存取。
Enables access to a member of the collection by integer index.
传回具有指定之名称的这个集合成员。
Returns the member of this collection with the specified name and of the specified type.
It's the sum of the individuals who comprise it.
共同体,是其成员的集合。
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