in the 1990s= in the 1990's. 意为：. 在二十世纪九十年代. in 1990s 是错误的.英语没这种说法,因为：. 逢十的复数数词表哪个世纪的几十年代时,前面必须加the. 而如果表示在那一年,是不能在后面加s 或者‘s 的. 如：. in 1990 在1990年.
是90后的意思吗？
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In the 1990S 和 In 1990s 和In 1990's 还有什么,怎么区分这几组词? “在九十年代的”in the 1990s对么? 表示20世纪90年代 in the 1990s和in the 1990's 哪个正确?
Decade of the Gregorian calendar
The 1990s was the decade that began on 1 January 1990, and ended on 31 December 1999. Known as the "post-Cold War decade", the 1990s were culturally imagined as the period from the Revolutions of 1989 until the September 11 attacks in 2001. The dissolution of the Soviet Union marked the end of Russia's status as a superpower, the end of a multipolar world, and the rise of anti-Western sentiment. C... Wikipedia
