Any element that does have such a collection must override this method and map the index to an equivalent index in the child element collection that is supported by that element.

确实具有此类集合的任何元素都必须重写此方法，并且将索引映射到该元素支持的子元素集合中的等效索引上。

youdao

Any element that does have such a collection must override this method and map the index to an equivalent index in the child element collection that is supported by that element.

确实具有此类集合的任何元素都必须重写此方法，并且将索引映射到该元素支持的子元素集合中的等效索引上。

youdao