在三十年代有很多麻疯病人。
There were many people with leprosy around the age of thirty.
在三十年代，航空运输成了赢利的行业。
In the 1930's airplane transportation became a profitable industry.
图中很清楚的显示出在三十年代，G.D.P.下跌的更厉害。
The chart clearly shows that G.D.P. fell further in the nineteen-thirties.
图中很清楚的显示出在三十年代，G.D.P.下跌的更厉害。
The chart clearly shows that G.D.P. fell further in the nineteen-thirties.
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