英汉词典

1. (数字)20
    Twenty is the number 20.

2. (20 至 29 之间的数字)二十几
    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.

    e.g. They're both in their twenties and both married with children of their own.
           他们俩都二十几岁，都已经结婚生子了。

3. 二十世纪二十年代(1920 至 1929 年间)
    The twenties is the decade between 1920 and 1929.

    e.g. It was written in the Twenties, but it still really stands out.
           它写于20世纪20年代，但直到今天仍然备受瞩目。