这个词是什么意思？
A monarchy located in north Asia bordering the Arctic Ocean, extending from Europe (the portion west of the Urals) to the North Pacific Ocean. St Petersburg was the capital 1712–1918. Moscow was the capital before St. Petersburg and following it.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D012425 · MeSH 2026。
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