- 問題詳情: Secretcodes(密碼)keepmessagesprivate.Banks,companies,andgovernmentagenciesusesecretcodesindoingbusiness,especiallywheninformationissentbycomputer.Peoplehaveusedsecretcodesforthousandsofyears.71Codebreakingneverlags(落後)farbehindcodemaking....
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