fad|fads

去年流行的彩虹吐司只是一时的风尚。

The rainbow toast trend last year was just a ___fad.

社交媒体上的这些新潮趋势来得快去得也快。

These social media ___fads gain popularity quickly but fade away just as fast.

穿破洞牛仔裤只是一时的流行趋势，很快就会过时。

Wearing ripped jeans is just a passing ___fad, it will soon go out of style.