mellow earth ; spongy soil
... 海绵土 mellow earth 含硫层 sulfuric horizon 含盐风化壳 salic weathering crust ...
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研究人员报道：“土卫七最显著的视觉特征是其类似海绵的外表，这跟以前所获得的任何天体的图象都不相同。”
"The most striking visual aspect of Hyperion is its sponge-like appearance, which is unlike any other object imaged to date," they report.
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