dried alum

• 干燥明矾

dried alum的用法和样例：

例句

1. You can clarify the water by adding a little alum.
   你在水里加一点明矾就能使水净化。
2. But chemical mordants such as alum are popular today.
   但化学腐蚀剂如明矾今天已经十分普遍。