You're holding the camera the wrong way up !
你把照相机拿颠倒了。
The back camera takes decent pictures but it's the practice of holding up a large slab to take a picture that feels a bit weird.
背面的摄像头用来拍摄远照片但是拿着一个大板子来拍摄照片感觉有点怪异。
To authorise a payment they look into the camera and must verify they are not just holding up a photo of someone else.
为了授权支付，用户需看着相机，还必须证明他们不是仅仅举着一张别人的照片。
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