18th or 19th centuries 为什么用复数?而不是18th or 19th century.如题

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18th or 19th centuries 为什么用复数?而不是18th or 19th century.如题
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18th or 19th centuries 为什么用复数?而不是18th or 19th century.如题
18th or 19th centuries 为什么用复数?而不是18th or 19th century.
如题

18th or 19th centuries 为什么用复数?而不是18th or 19th century.如题
[1] The Industrial Revolution of the late 18th and early 19th
centuries 正确 was revolutionary because it changed -- revolutionized -- the
productive capacity of England,Europe and United States.
[2] People living in the 18th or 19th [century正确] would never imagine the advanced household appliances we are now able to enjoy.

这是个错句子。正确的如楼上、

the 18th century 十八世纪 ，不需要复数

超过1个世纪用复数啊~

18th or 19th centuries 为什么用复数?而不是18th or 19th century.如题 英文日期缩写 这样对?1st 2nd 3rd 4th 5th 6th 7th 8th 9th 10th ； 11th 12th 13th 14th 15th 16th 17th1st 2nd 3rd 4th 5th 6th 7th 8th 9th 10th ； 11th 12th 13th 14th 15th 16th 17th 18th 19th 20th ； 21st 22nd 23rd 24th 25th 26th 27th 28th 29t during the 18th and 19th centuries thousands of Decembeir1,2006 is the World AIDS Day?A.17th B.18th C.19th D.20th akb48中的 13th 17th 19th 是什么意思呀? ()()()th()() ()()th()() ()()th()() ()()()th()() ()()()th()() ()()th()() 填写字母,成为单词. 初中英语in the 18th and 19th centuryin the 18th and 19th century（century要变为复数centuries吗?为什么?） AKB48中的18th 英语1892年是18th还是19th century 怎么读呢 用th组英语单词( )( )( )th( )( )( )( )th( )( ）( )( )th( )( )( )( )th( ） Today is november 19th 对november 19th 提问 Marxist Philosophy in 19th THE 19TH WIFE怎么样 in the 19th是什么意思 ( )( )th( )英语单词 10th m( )( )th TH是什么意思?