Despite its length it is not, as is sometimes claimed, visible from space.
尽管长城很长，但不像有时人们说的那样从太空里能看见它。
The Great Wall of China is not visible from space.
太空中看不到中国的长城。
It was visible along a roughly 250 km-wide (155 miles) corridor, U. S. space agency NASA said.
NASA称可见区域是一条宽度约为250千米（155英里）的狭长地带。
It was visible along a roughly 250 km-wide (155 miles) corridor, U. S. space agency NASA said.
NASA称可见区域是一条宽度约为250千米（155英里）的狭长地带。
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