| 单词 | captcha |
| 释义 | captcha (kæptʃə) Word forms: plural captchas variable noun Captcha is a system for checking that a human and not a machine is using a computer. Captcha is an abbreviation for 'completely automated public Turing test to tell computers and humans apart'. We use captcha to screen for spam. captcha in British English (ˈkæptʃə) noun a test designed to determine whether a computer user is a person or a machine, eg by asking the user to decipher a distorted image Word origin C21: acronym for C(ompletely) A(utomated) P(ublic Turing Test to) T(ell) C(omputers and) H(umans) A(part) |
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