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

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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)