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对外部引用数据进行验证。
Validating against external reference data.
youdao
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它在外部进行实现的这个事实是透明的，只需使用该引用即可。
The fact that it is implemented externally is transparent; you just use the reference.
youdao
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它在外部进行实现的这个事实是透明的，只需使用该引用即可。
The fact that it is implemented externally is transparent; you just use the reference.
youdao