When you talk about the twenties, you are referring to numbers between 20 and 29. For example, if you are in your twenties, you are aged between 20 and 29. If the temperature is in the twenties, the temperature is between 20 and 29 degrees.
They're both in their twenties and both married with children of their own.
他们俩都二十几岁了,都已结婚生子。
The twenties is the decade between 1920 and 1929.
It was written in the Twenties, but it still really stands out.
它写于二十世纪二十年代,但现在仍很引人注目。
twenties
Twenty is the number 20.