It is the heaviest in as many as five decades.
這是五十年來(lái)最嚴(yán)重的一次。
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兩個(gè)地方需要注意。第一，“五十年”，這里用的詞是decade（十年）；第二，“在五十年中”，不要丟了介詞in。
原句是：
In many areas, where snow has continued falling for several days, the accumulation has been described as the heaviest in as many as five decades.
在許多地區(qū)，大雪已連續(xù)下了很多天，積雪被稱為五十年來(lái)最嚴(yán)重的一次。
海納百川，有容乃大；壁立千仞，無(wú)欲則剛。