It's a little like how you can keep moving forwards on the earth, but earth'scurvature brings you back to where you started.
这有点像是你在地球上不停地向前走,但地球的曲率把你带回了起点。
2
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)。
3
The convergence of error brought about by the curvature of earth's surface obviously has no counterpart in free space.