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21. 虽然人脸识别已经在智能手机中普及，但用在动物上难度则要大得多。

    suī​rán rén​liǎn​shí​bié yǐ​jing zài zhì​néng​shǒu​jī zhōng pǔ​jí, dàn yòng zài dòng​wù shang nán​dù zé yào dà de duō.

    Although face recognition has become popular in smartphones, it is much more difficult to use on animals.

    Source: CCMatrix