floating scum

• 浮渣

floating scum的用法和样例：

例句

1. When the meat is boiling, remove the scum.
   当肉煮沸时，把浮在上面的浮渣撇掉。
2. These products tend to react with soap and detergents and produce soap scum.
   这些产品往往会跟肥皂和洗涤剂反应，产生肥皂浮渣。