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

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18thor19thcenturies为什么用复数?而不是18thor19thcentury.如题18thor19thcenturies为什么用复数?而不是18thor19thcentury.如题18

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~