in 1950 ,in 1950s,in the 1950s,in the 1950's,in 1950's这四个短语都存在么?

问题描述:

in 1950 ,in 1950s,in the 1950s,in the 1950's,in 1950's这四个短语都存在么?

in 1950 “在1950年”,in the 1950s
“在二十世纪五十年代”有,其它没有