他们的创业计划起初很吸引人，但几个月后就逐渐失败了。

Their startup idea seemed promising at first, but it ___fizzled out after a few months.

汽水瓶盖没拧紧，里面的气体嘶嘶地往外冒。

The soda bottle wasn't closed tightly, and the gas ___fizzled out.

派对开始很热闹，但很快就冷清了下来。

The party started lively but soon ___fizzled out.