能看清长城的最远距离取决于成像系统(眼睛)的角度分辨率以及长城与它周围环境的对比度。
The distance the wall could be seen depends on the angular resolution of the imaging system (the eye) and the contrast of the wall vs. background.
长城，是世界上最伟大的奇迹之一，于1987年被联合国教科文组织列为世界遗产。
The Great Wall, is one of the greatest wonders of the world, was listed as a World Heritage by UNESCO in 1987.
登楼眺望，长城自西南向东北蜿蜓于山脊之上，宛如苍龙，宏伟壮观。
Langdon floor, wall overlooking the southwest toward northeast wan ting in above, like black dragon, ridge spectacular.
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