why this image
为什么是这个图像？
以上为机器翻译结果，长、整句建议使用 人工翻译 。
That said, the image could help explain why others might have had difficulty identifying the existence and motives of this terrorist cell.
CNN: A new plague
This refraction eliminates both the red end of the spectrum (red light is not bent enough by the air layer to form part of the second image) and the blue frequencies (which are scattered away: this selective scattering is why the sky is blue).
ECONOMIST: In a flash
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