601 Scientists have suggested that once every 10 million years or so a truly colossal object from space cuts through the atmosphere and slams into Earth, sending up a global pall of dust that blots out the Sun, alters the climate, and changes the course of evolution by killing off many plant and animal species.
(A) sending up a global pall of dust that blots
(B) thus sending up a global pall of dust to blot
A和B的区别在哪里呢?
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