fad

一时的流行、风潮、热潮

Bubble tea shops were just a fad in that neighborhood.

珍珠奶茶店在那一带只是一时的流行。

一时的狂热、短暂的嗜好

Collecting stamps was a childhood fad he soon outgrew.

集邮是他小时候一时的狂热，很快就没兴趣了。

流行一时的、赶时髦的限定用法

Most fad diets fail because nobody can follow them long.

多数流行一时的减肥法都会失败，因为没人撑得久。