其中白色是广角像素、蓝色是窄角像素，转动屏幕，窄角像素就看不见了。
There's also a special Leica edition of the 17 Ultra, which is largely the same, specification-wise, but with a manual zoom ring around the camera unit. It's a cool gimmick, but felt oddly loose on a few devices I've handled.
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return new TaskExecutor() {
A device based on light-confining materials can modify superconductivity using quantum fluctuations, without the need for external illumination.