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

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~

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