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Facebook first showed off its 3D photos back in 2018, and shared the technical details behind it a month later. But unless you had one of a handful of phones with dual cameras back then (when they weren’t so common), you couldn’t make your own. Today an update brings 3D photos to those of us still rocking a single camera. 2018年Facebook首次展示了3D照片，一个月之后又分享了产品的技术细节。但当时除非你有一部双摄像头的手机（那时这种手机还不多），否则你自己拍不出这种效果。现在更新后的技术让我们只有单摄像头手机的人也能拍出3D照片了。 In case you don’t remember or haven’t seen one lately, the 3D photos work by analyzing a 2D picture and slicing it into a ton of layers that move separately when you tilt the phone or scroll. I’m not a big fan of 3D anything, and I don’t even use Facebook, but the simple fact is this feature is pretty cool. 以防你忘了或者最近没见过Facebook的3D照片，我可以告诉你，这种3D照片技术先要分析2D照片并把它切分成很多层，倾斜手机或滚动屏幕时各层可以独立移动。我不是特别热衷3D的东西，我甚至都不用Facebook，但我喜欢这个功能的原因很简单，就是它太棒了。 The problem is it used the dual-camera feature to help the system determine distance, which informed how the picture should be sliced. That meant I, with my beautiful iPhone SE, was out of the running — along with about a billion other people who hadn’t bought into the dual-camera thing yet. | 
