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定义
一种历史距离单位，最初定义为一个人或一匹马一小时内步行的距离，在英语国家最常标准化为约4.8千米（3英里）。
解释
Leagues varied significantly by country and era: the Spanish legua was ~4.2 km, while the nautical league equals exactly 3 nautical miles (~5.556 km). Jules Verne's '20,000 Leagues Under the Sea' refers to horizontal distance traveled, not depth — 20,000 leagues is roughly 111,000 km, nearly three times Earth's circumference. The unit is no longer used in formal measurement but persists in literature.
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