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http://nozaki.com/2018/02/09/iphone-x-%e3%81%ae-face-id-%e4%bd%bf%e7%94%a8%e5%87%ba%e6%9d%a5%e3%81%aa%e3%81%8f%e3%81%aa%e3%81%a3%e3%81%9f%e5%a0%b4%e5%90%88/
iPhone X の Face ID 使用出来なくなった場合