in the 1950s还是in 1950s

in the 1950s 还是in 1950sin the 1950's 还是 in 1950's in the 1950s还是in 1950s in the 1990s'还是in the 1990's in 1990s还是in the 1990s IN 1960S 还是IN THE 1960S in 1950s 与in the 1950s有什么区别?in 1950s是表示1950----1959还是1940---1949?in the 1950s呢? in the 1970s=in the 1970's还是=in 1970's 是in1980s还是in the 1980s What's the weather like in winter in Beijing?还是What's the weather like in Beiing in winter? 是in the barber's 还是at barber's 在90年代是 in 90s 还是in the 90s?那么,in the 1620s 是什么意思? in early 1990s还是in the early 1900s?到底加不加这个the? 英译中 in the 1950s in the 19th century in the cat,s In the stationary’s 19世纪30年代用英语怎么说是in 1930s 还是in the 1930s 在20世纪60年代 英语是in 1960s还是in the 1960s 是in 1980s对还是in the 1980s对?