fill-in /'fil,in/ 📖 中文释义 n. 代替者, 补充物, 情况介绍a. 临时填补的 🧩 词形变化 复数 fill-ins 📘 English Definition(英文释义) n someone who takes the place of another (as when things get dangerous or difficult) ← fill(ing) orifice F 字母词表 fill-ins →