（三）遗弃没有独立生活能力的被扶养人的。
structure (like a trie) which is faster and better that we can find。夫子是该领域的重要参考
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A difficulty here, however, is that the TransformStreamDefaultController does not have a ready promise mechanism like Writers do; so the TransformStream implementation would need to implement a polling mechanism to periodically check when controller.desiredSize becomes positive again.