20世纪中后期英文

Medium expect behind

mid-Seventies of twentieth century,mid-Seventies of last century,这个是楼主需要的完整答案！mid-'70s 或者 mid-seventies 也都可以，不过比较简单不太完整看楼主在什么场合使用吧，在不太正式的场合也可以简化使用希望帮的到楼主，半夜码字不容易，希望采纳最后祝愿楼主生活愉快，一切顺利！！！

In the middle and late 20th century, with the rapid development of science and technology, high - tech, represented by network science and technology, came out one after another. At the same time, all kinds of high - tech crimes, represented by cyber crime, are beginning to appear, posing a potential threat to the healthy development of the society. How to prevent and reduce high-tech crime has become a common concern. China also faces the same problem. In order to avoid or reduce the resulting loss, in daily life, we should improve our vigilance to avoid being cheated.20世纪中后期，随着科学技术的迅速发展，以网络科技为代表的高科技相继问世。但与此同时，以网络犯罪为代表的各种高科技犯罪也开始出现，对社会的健康发展带来潜在的威胁。如何预防和减少高科技犯罪已成为受到普遍关注的问题。中国也面临着同样的问题。为避免或减少由此带来的损失，在日常生活中，我们应该提高警惕，避免上当受骗。

{He actively expanded Starbucks's market in the United States.Howard keen insight and judgment to make Starbucks rapid growth}不知道翻译的对不对？望采纳~

mid-seventies 或者是 mid-'70s 你没有必要写出来20世纪 (twentieth century; 20th century), 上一个70年代就是20世纪的1970年代,除非你要写更久以前的70年代才有必要整个写出来;老外习惯省略了。 60年代80年代也差不多,只要在数字前面加一个「’」、数字后面加「s」即可

mid-1970s读成mid nineteen-seventies

二十世纪年代初 In the early 20th century 十八世纪中期 The mid-18th century十九世纪后期 The late 19th century 阴历 Lunar calendar阳历 Gregorian