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Meteorologists have divided the atmosphere into various shells or layers, laid one atop the other.
气象学家把大气分成不同的层，它们依次相叠。
youdao
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It is fun picking up various shells on the beach.
在海滨捡各种贝壳是很有趣的。
youdao
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It is fun picking up various shells on the beach.
在海滨捡各种贝壳是很有趣的。
youdao