Alum
n. 明矾, 矾, 校友\\n[化] 明矾; 钾铝明矾
📖 牛津释义
alum
n[U]
white mineral salt used in medicine and in dyeing 明矾, 白矾（用於医药及染色）.
🗣️ 情景例句
but it'll take you ten minutes longer.
但会多花你十分钟的时间。
No, she isn't.
不，她不是。
What about this one?
这种如何？