such as alum
比如明矾
以上为机器翻译结果，长、整句建议使用 人工翻译 。
But chemical mordants such as alum are popular today.
但如今明矾一类的化学媒染剂更受欢迎。
youdao
A salt, such as alum, that ionizes in solution as if it were two separate salts but forms a single substance upon crystallization.
溶解电离时好似是两种不同的盐，结晶时却构成一种物质，如明矾。
Wood ash is one example. But chemical mordants such as alum are popular today.
VOA: special.2010.08.02
Victorian industrialists mined the area for minerals such as alum, jet and ironstone.
BBC: The perfect trip: Yorkshire
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