The system is not 100 per cent foolproof.

该系统不是百分之百不出毛病的。

《柯林斯英汉双解大词典》

However, the system isn't foolproof.

不过，系统并非万无一失。

youdao

No system can be fully foolproof.

没有哪个系统是万全的。

youdao

"You cannot build a foolproof system for air security unless you are willing to slow the whole air system down to a crawl and institute very, very invasive procedures before Americans get on airplanes,".

VOA: standard.2009.12.30

So the system is not foolproof." "But overall,it is in our view, the better system than anywhere else in the world because it gives average citizens an opportunity to listen to the evidence and make independent judgments the government is not part of."

VOA: special.2009.08.31

The system is not foolproof, though it is designed to be nearly so.

ECONOMIST: Tuberculosis in India

First, no system can be foolproof.

ECONOMIST: The revolution within

Robert Colby has evolved a system that, while hardly foolproof, is pretty clever ( Click here for more).

FORBES: Magazine Article