1·Alum will settle turbid water.
明矾可以澄清浊水。
—— 《新英汉大辞典》
2·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。
3·Purchase alum from any grocery store or pharmacy.
首先从食品杂货店或者药店买一些明矾。
4·So if you just want to be on the safe side, you can make one on your own by using aluminum potassium sulfate or alum for short.
但是你如果仅仅是为了以防万一，那不如你自己用硫酸铝钾或者明矾来自己制作一件。
5·The simple steps in how to use alum to fireproof is listed below.
下面的步骤就是讲解如何用明矾来制作防火衣。