如果你听妈妈的话,你或许会觉得吃胡萝卜会带给你如鹰眼般的超能力。事实是,胡萝卜含有能帮助你的身体更好地吸收维他命A的β-胡萝卜素,它们确实滋养了你的眼睛。但是除此之外还有许多食物都含有β-胡萝卜素(比如甘薯,和羊肝),而且维他命A只会让你的眼睛更健康,而不是真的就让你变成鹰眼。
The Great Wall of China is not the only man-made object visible from space; in fact, it's barely visible at all
从外太空望向地球,长城并不是唯一能够看见的人造建筑。事实上,它压根儿就看不见啊!
If you're in a very low orbit and you use some kind of scope or zoom in with a camera, then sure, you can probably just barely make out the Great Wall from space. But you could also see the Great Pyramid or a bunch of other large structures, too...and seeing any of them from a higher orbit with the naked eye is probably impossible.
假如你飞在一个比较低的轨道上,装备某种望远镜或者用相机放大,那么你确实可能勉模模糊糊地从外太空分辨出长城。但是与此同时,你也能看见埃及金字塔和一帮其它的大型建筑……当你飞到更高的轨道上之后,这些东西就在裸眼视界里完全消失了。
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