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foolproof

/ˈfulˌpruf/

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English pronunciation · Synthesized MP3 · Audio-factory quality review passed

1 · adj.

so simple or well designed that it is unlikely to fail

万无一失的；易操作的

Read the example to see foolproof in context.

The instructions are clear, but no system is entirely foolproof.
English pronunciation · Synthesized MP3 · Audio-factory quality review passed

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说明很清楚，但没有任何系统能保证绝不出错。
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Pronunciation: /ˈfulˌpruf/

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