1. I figured him to be about thirty years of age.
   我猜想他大约30岁。
2. Three quarter of the staff is less than thirty years old .
   百分之七十五的员工不到30岁。
3. The age of the horse is from twenty-five to thirty years.
   马的寿命为廿五至卅岁
4. He was famous by the time he entered his early thirties.
   他30出头就已经出名了。
5. There's one at nine thirty tomorrow morning.
   明天上午9:30有一航班。

　2个名词解释