10-4 means "OK," "understood," and "affirmative." Commonly known as CB radio lingo, originating from the need for brevity in radio transmission.
me--"Is anyone there?"
respondent--" 10-4"(to indicate presence).
me--"Let's roll."
respondent--"10-4"(to indicate agreement).
最初是为了无线电发报时做的简写，意思就是：十分肯定，明白
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