用SEM观察其表面形貌。
扫描电镜观察其表面结构。
The surface structure was observed under the scanning electronic microscope.
上图中，对土卫十六本身表面的近距离观察展现了其有趣的结构和坑洞。
Close inspection of the surface of Prometheus itself in the above image shows interesting structure and craters.
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