Split and join nodes come in pairs.

分离节点和连接节点是成对出现的。

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Listing 7 demonstrates the upper, lower, split, and join methods.

清单7演示了upper、lower、split和join方法。

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Listing 7 demonstrates the upper, lower, split, and join methods.

清单7演示了upper、lower、split和join方法。

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