white alum的用法和樣例：
例句
- Polyelectrolytes as coagulant aids lower the required dosages of alum and auxiliary chemicals.
高分子電解質作為凝結劑援助更低白礬和輔助化學製品必需的劑量。 - You can clarify the water by adding a little alum.
你在水裡加一點明礬就能使水凈化。 - But chemical mordants such as alum are popular today.
但化學腐蝕劑如明礬今天已經十分普遍。
