Shuǐxīng shì tàiyángxì zhōng zuì xiǎo de xíngxīng.
Mercury is the smallest planet in the solar system.
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In Chinese astronomy, the five visible planets are named after the five elements: 水星 (water/Mercury), 金星 (metal/Venus), 火星 (fire/Mars), 木星 (wood/Jupiter), 土星 (earth/Saturn).
