英语翻译A computer-generated view of the Martian north polar region shows the extent of what may have been an ancient ocean covering much of the northern lowlands.

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英语翻译Acomputer-generatedviewoftheMartiannorthpolarregionshowstheextentofwhatmayhavebeenanancientocean

英语翻译A computer-generated view of the Martian north polar region shows the extent of what may have been an ancient ocean covering much of the northern lowlands.
英语翻译
A computer-generated view of the Martian north polar region shows the extent of what may have been an ancient ocean covering much of the northern lowlands.

英语翻译A computer-generated view of the Martian north polar region shows the extent of what may have been an ancient ocean covering much of the northern lowlands.
在这个句子中,what 引导了what may have been an ancient ocean covering much of the northern lowlands这个主语从句,整个主语从句作为介宾短语of的宾语成分
一份火星极地区域的计算机生成视图显示了可能是一个覆盖大部分北部低地的远古海洋的范围