This provides referential basis for improving one's ability for expression of spoken language.

这对提高人们的言语表达能力，具有一定的参考价值。

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This provides the ability to override functionality already available in the class hierarchy tree.

这提供了在类层次树重写功能已经可用的能力。

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This provides the ability to override functionality already available in the class hierarchy tree.

这提供了在类层次树重写功能已经可用的能力。

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