in the 1940's in 1940s in the 1940s区别~

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inthe1940''sin1940sinthe1940s区别~inthe1940''sin1940sinthe1940s区别~inthe1940''sin1940sinthe1940s区别~只有：inth

in the 1940's in 1940s in the 1940s区别~
in the 1940's in 1940s in the 1940s区别~

in the 1940's in 1940s in the 1940s区别~
只有：in the 1940's/in the 1940s的表达（表示20世纪40年代）