Smartphones also typically feature cameras with a macro mode that allows automatic focus over very short distances to scan codes that appear in a newspaper or magazine.
智能手机还带有具有微距模式的摄像头，这些摄像头可以短距离自动对焦扫描出现在报纸和杂志上的条码。
etc/bluetooth/hcid.conf: HCI daemon configuration file used by hcid that specifies link mode (master or slave), link policy, inquiry and scan mode, and so on
etc/bluetooth/hcid.conf：hcid 所用的 HCI 后台进程配置文件，它指定了链接模式（主或从）、链接策略、询问和扫描模式，等等。
To do this, run the scan in Safe mode.
要做到这一点，运行在安全模式下扫描。
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