教育

Smarties' Power English 第234期
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Comic﹕CAPTCHA

【明報專訊】If you have ever tried to register with a website, you may have been asked to enter some characters that were all jumbled up, or to answer a simple question for verification. They were all CAPTCHAs (驗證碼), which are used to tell a human from a machine and stop computer hackers.

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