light-year 📖 中文释义 n. 光年 🔗 释义中的汉语词 🧩 词形变化 复数 light-years 📘 English Definition(英文释义) n the distance that light travels in a vacuum in 1 year; 5.88 trillion miles or 9.46 trillion kilometers ← light-wells L 字母词表 light-years →