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English

There are two geologically distinct plains units on Mercury: Inter-crater plains are the oldest visible surface, predating the heavily cratered terrain.

Chinese

水星表面有兩種在地質性質上完全不同的平原: 撞擊坑間平原(Inter-crater plains)是水星地表可見最古老區域,早於重隕擊區(heavily cratered terrain)。