It is the heaviest in as many as five decades.
这是五十年来最严重的一次。
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两个地方需要注意。第一，“五十年”，这里用的词是decade（十年）；第二，“在五十年中”，不要丢了介词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.
在许多地区，大雪已连续下了很多天，积雪被称为五十年来最严重的一次。作者: 簿子酒 时间: 2009-11-26 22:56
in as many as six decades
It is the frist rainning at as many as weeks.作者: 小陶子 时间: 2013-11-26 21:13
i do not understand,what 's meaning of the frist raining
