scum

• 名词，有两个主要意思：一指浮在液体表面的污垢、泡沫或杂质层；二为比喻用法，指被认为卑劣、无价值的一群人。

A noun with two primary meanings: it can refer to a layer of dirt, froth, or impurities that forms on the surface of a liquid, or it can be used figuratively to describe a group of people regarded as contemptible or worthless.

不可数

1. Worthless peopleB2informal

   A derogatory term for people considered to be worthless, immoral, or contemptible.

   人渣

   • Those scum stole my wallet.
   • He called the criminals the scum of the earth.
   • Don't associate with that scum.

   同义词filthgarbagerabbleriffraffswinetrashvermin

2. Impurity film on liquidB1formalscientific

   A layer of dirt, froth, or impurities that forms on the surface of a liquid, often due to boiling or stagnation.

   浮沫

   • There was a layer of scum on the pond.
   • Boil the broth and skim off the scum.
   • The water had a greenish scum from algae.

   同义词crustdepositdrossfilmfrothresidueskin

• 动词，指撇去液体表面的浮沫、杂质或去除水垢（锅垢）；也指液体表面形成泡沫或浮渣。

A verb used to indicate the act of removing scum or forming a layer of scum on the surface of a liquid.

1. Remove impuritiesB2formal

   To remove a layer of dirt, foam, or impurities from the surface of a liquid.

   撇去浮沫

   • She scummed the broth to make it clear.
   • The chef scummed the boiling jam to remove any froth.
   • He carefully scummed the surface of the soup.

   同义词skim