The curvature of the Earth’s horizon (the limb) is clearly visible, as is the faint blue line of the upper atmosphere directly above it (at image top center).

地球地平线的曲线（周边）清晰可见，它的正上方隐约显现出高层大气的蓝线（图片中上部）。

youdao

The curvature of the Earth's horizon (the limb) is clearly visible, as is the faint blue line of the upper atmosphere directly above it (at image top center).

地球地平线的曲线(周边)清晰可见，它的正上方隐约显现出高层大气的蓝线(图片中上部)。

youdao

Sometimes the line between old behavior (the seeking of the geographical cure) and my inquisitiveness is faint.

有时候，旧有的行为模式（寻求地理治疗）与好奇心之间的界限是模糊的。

youdao

We walked right down the middle of the highway, over the faint ghost of the double yellow line.

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