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+5MIN reminds us that we must be punctual,so take action early.Because being on time is very important for everyone. In most situations, people are late within 5 minutes. If we act 5 minutes earlier, we won't be late.
-5MIN suggests that we need to be tolerant and apprehensive.Since that any of the two clocks are inconsistent,if you are handling the time node, please admit the unavoidable time error on the premise of rules.
JinFeng/Lei HaiJiang/Tang Long/Zeng XuJiang/Zhao