单词：white alum
white alum的用法和样例：
例句
- Polyelectrolytes as coagulant aids lower the required dosages of alum and auxiliary chemicals.高分子电解质作为凝结剂援助更低白矾和辅助化学制品必需的剂量。
- 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。
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