最佳解答: 1. scum---浮渣
a thin layer of impurities which forms on the top
of liquids or bodies of water, often as the result of
boiling or fermentation (發酵)
It's similar to "hot or fiery".
3. forming ability---塑造力( Not quite sure!)
any of a number of water-soluble (水溶性),
gummy (膠質的), dextrorotatory polysaccharides
obtained from the breakdown of starch( 澱粉)
and used as adhesives (黏著物), as sizes, in certain foods, etc.
Definitions are cited from http://www.yourdictionary.com
Hope my search and explanation offer helps!