in the 1970s=in the 1970's还是=in 1970's

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inthe1970s=inthe1970''s还是=in1970''sinthe1970s=inthe1970''s还是=in1970''sinthe1970s=inthe1970''s还是=in1970''si

in the 1970s=in the 1970's还是=in 1970's
in the 1970s
=in the 1970's
还是=in 1970's

in the 1970s=in the 1970's还是=in 1970's
in the 1970's