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The earth is surrounded by a layer of air called the atmosphere.
在地球外面包围着一层空气，叫做大气层。（主语转换为状语）
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Surrounding the earth is a layer of air of unknown thickness.
环绕地球的是一层空气，其厚度尚未为人所知。
youdao
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Surrounding the earth is a layer of air of unknown thickness.
环绕地球的是一层空气，其厚度尚未为人所知。
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