这也造就了检索的一种新玩法：交错输入（interleaved input）。
但对于编剧来说，创作本身始终是一种慢工作。
，详情可参考有道翻译
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These solutions look nothing like the preorder solution. If we had an implementation using the preorder traversal and we were asked to change to the postorder traversal we would have to invent a whole new approach from scratch. Our existing code would turn into wasted effort, the temporary results of work which did not move us any closer to our next goal.