degrease       
verb [ T ] uk/ˌdiːˈɡriːs/ us/ˌdiːˈɡriːs/
 去除油污;脱脂
to remove grease (= oil or soft fat) from a surface or object
  To degrease a sauce is to skim the fat off its surface. 去除酱汁的油脂就是把酱汁表面的油脂去掉。 
 The solvents used to degrease aircraft engines are hazardous. 用来给飞机发动机脱脂的溶剂是对人体有害的。 
 - More examples
 - Rub down the window frame with abrasive paper then degrease the surface with white spirit.
 - The stock is usually seasoned, strained, degreased, and concentrated so it can be used as a base for sauces and soups.
 - If I didn't have a bad knee I'd be up on the kitchen counter degreasing the cooker hood.
 - Degrease your bike chain, and clean the cogs with a stiff-bristled brush.
 - These products are used to degrease skin and reduce sebum.