单词：potash alum
potash alum的用法和样例：
例句
- 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。
- 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。
- alum[化]白矾
- potassium alum钾明矾,钾矾,铝钾矾,钾...
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