in the 1970s和in the 1970's有区别吗?

in the 1970s和in the 1970's有区别吗? in the 1970s和in the 1970's有区别吗,还有怎么读? in 1970、in the 1970、in the 1970‘s、in the 1970s有什么区别 in the 1970s和in 1970s 有什么区别 in the 1970与 in the 1970s 有什么区别吗? in 1960s和in the 1960’s有区别吗? in the 1970s in the 1960's 和in the 1960s 有什么区别 in the 1920's和in the 1920s 有何区别么? in the 1930s和 in the 1930's有什么区别 in 1960's 和in the 1960s的区别 in the 1900s 和in 1900s的区别