1. But not one pair of eyes strayed from the history books which twenty-five little girls were studying so earnestly.
    25个小女孩正在认真地学习历史，没有一双眼睛离开课本。

2. For the puma was often observed at one place in the morning and at another place twenty miles away in the evening.
    因为常常是早晨在甲地发现那只美洲狮，晚上却在20英里外的乙地发现它的踪迹。

3. We saw a herd of deer of twenty.
    我们看见一群二十只的鹿。

4. While he was eating, I asked him to lend me twenty pounds.
    当他吃饭时，我提出向他借20英镑。

5. We see the change from new moon to quarter to full and back to new moon every twenty-eight days.
    我们每二十八天就能看到从新月到半月、到满月再回到新月的变化过程。

6. We wanted to avoid the mistake made by many couples of marrying for the wrong reasons, and only finding out ten, twenty, or thirty years later that they were incompatible,
    许多夫妻因为错误的理由结了婚, 结果在10年、20年或30年后才发觉他们原来是合不来的，

7. We already see that. One recent estimate is that one-sixth of all fourteen- to twenty-four-year-olds in America — mostly males — are currently "disaffected and disconnected".
    我们已经看到了这一点。最新的一项估计表明，美国所有14至24岁的人当中有六分之一--大多数为男性--现在已 "心存不满，与社会格格不入"。

8. The Constitution of the United States has over twenty amendments.
    美国宪法有二十多条修正案。

9. Their friendship lasted for twenty years.
    他们的友谊持续了二十年。

10. The first twenty or thirty pages of many of them had their margins filled with pencilled notes .
    其中很多书头二、三十页的边上都用铅笔写满了批注。