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1.get back to 返回到
Let's get back to what we were saying before we were interrupted.
让我们回到被打断的话题上去。
2.stretches across 横跨
Rain continued: From now on, when it rains, each of you will stretch across the sky in a great bow of color as a reminder that you can all live in peace.
雨接着说：从今以后，只要一下雨，你们每个都得伸展成大弓形横跨在天际，藉以提醒大家和平共处。
3.collide with 与...相撞
A number have orbits that take them closer into the solar system that sometimes lead them to collide with Earth or the other inner planets.
有很多小行星的轨道可以把它们带到太阳系的更内层，有时甚至会使它们与地球或其它内行星相撞。
