in 20-year time和in 20 years' time区别

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in 20-year time和in 20 years' time区别
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in 20-year time和in 20 years' time区别
in 20-year time和in 20 years' time区别

in 20-year time和in 20 years' time区别
1 in 20 years 20年里
2 in 20 years' time 20年后
3 in a 20-year time =in a period of 20 years 在20年这段时间里(表示一个周期)