这是25年以来最严重的暴风雪 英语翻译

严重用fierce好

This is the worst snow storm in 25 years.
或者
This is the worst blizzard in 25 years.

This has been the most serious storm during the past 25 years..

这是25年以来最严重的暴风雪.

this is the worst snowstorm in 25 years.

This is the worst blizzard in twenty-five years

It has been the most serious snowstorm since 25 years ago.

要用完成时，注意单词，since后加的时间应该是时间段加上ago.