海绵土 mellow earth
spongy soil
- 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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