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彩虹实际上是圆形的。

Rainbows look like arches (拱形), but they are actually round. When we are standing on the ground, rainbows seem to stop when they hit the ground. This is because they are partly blocked by the ground and horizon (地平线), so we only see half of them. But if we look out the window of an airplane on rainy or misty days, we might have the chance to see a full round rainbow. Book a window seat next time you fly and maybe you’ll get lucky!  TEENS