在被称为曙暮辉的太阳光线的照射下，它们实际上是由靠近遥远的西方地平线的云层产生的阴影，此时落日在云层的正后方渐渐隐去。
Outlined by rays of sunlight known as crepuscular rays, they are actually shadows cast by clouds near the distant western horizon, the setting sun having disappeared from direct view behind them.
今年三月份的时候科学家们就进行了初步的测量。但是现在，以我们在地球上的视角来观察，这对双星系统已经移动到了太阳的正后方，这就导致当前无法使用望远镜来观察这对双星。
Initial measurements were made in March, but now the binary system has moved almost directly behind the sun from our perspective on Earth, making the pair currently invisible to telescopes.
这片树林在我家正后方，只要直走三十分钟，就能到达学校所在的空地。
The forest is right behind my house, and if you just walk straight for about thirty minutes you get to the clearing, and that's where the school was.
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