二十一

• (=21) twenty one
• twenty-one

例句

1. 他数了一下在场的人数，结果共有二十一人。
   He counted the number of people present and fetched up with twenty-one.
2. 把书翻到第二十一页。
   Open your book at Page twenty-one.
3. 我已经过二十一周岁了。
   I was twenty-one on my last birthday.
4. 这笔钱委托他人代管，到他二十一岁才能使用。
   The money is being held in trust for him until he is twenty-one.