foil [fɔɪl]

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n.箔，金属薄片，陪衬；vt.挫败，使受挫折

a very thin sheet of metal , especially used to wrap food in to keep it fresh

Milk bottle tops are made of tin foil. 牛奶瓶盖是用锡箔做的。
An ugly woman serves as a foil to a pretty girl. 一个丑女人可以将美丽的姑娘反衬得更加漂亮。