foolproof
US /ˈfuːl.pruːf/
UK /ˈfuːl.pruːf/
形容詞
1.
絶対確実
(of a plan or machine) so simple and easy to understand that it is unable to go wrong or be used wrongly:
例:
•
I don't believe there's any such thing as a foolproof system for making money.
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