If it's still being used today, it must be a real proven system.

如果它一直沿用至今，它必须是一个真正的行之有效的制度。

youdao

"The best way to responsibly advance our security and the security of our allies is to deploy a missile defense system that best responds to the threats that we face and that utilizes technology that is both proven and cost effective."

VOA: standard.2009.09.17

But there isn't much else that is known about its capabilities beyond what already exists with GPS, which is a proven system.

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This is a time-proven system that works very very well.

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Rather than trying to figure out a business idea, you could buy into a big chain with a proven system and established brand name, rake in profits, and never have to report to a boss again.

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