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

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