这项应用采用智能手机自带的外置摄像头帮助行人观察其左右两侧的路况(至少是一边)。
The app USES the outward facing camera on a smartphone to help a pedestrian look both ways (or at least one way).
这项应用采用智能手机自带的外置摄像头帮助行人观察其左右两侧的路况(至少是一边)。
The app USES the outward facing camera on a smartphone to help a pedestrian look both ways (or at least one way).
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