upcast /'ʌpkɑ:st/ 📖 中文释义 n. 上抛, 向上投掷之物, 上风井a. 向上抛的, 向上的 📘 English Definition(英文释义) n. air passage consisting of a ventilation shaft through which air leaves a mine ← UPC U 字母词表 upchange →