translation.en: "You've got to get down there on your back, in front of a mirror, full-length preferred. You've got to get in the perfect position with the perfect light, which then becomes shadowed by the angle you're at.
translation.zh: “你得在镜子前面躺下来 最好是全身镜。然后要找最好的角度， 恰到好处的灯光，而灯光又被你的角度给挡住啦。