| 1. | He tore up the stairs two steps at a time . 他一步两个台阶地飞奔跑上楼。 |
| 2. | He came at a time when i least expected him ... 他在我最想不到的时候来了。 |
| 3. | Life passes, with us all, a day at a time . 我们大家的日子都一天一天地过去。 |
| 4. | I run out the guineas by one and two at a time . 我每回输一个金币或者两个金币。 |
| 5. | I ran out the guineas by one and two at a time . 我每回输一个金币或者两个金币。 |
| 6. | I can only carry two at a time . 我一次只能携带两个。 |
| 7. | Come on out. one lot at a time . 出来罢。一批一批来。 |
| 8. | I make a vow at a time to do this . 我曾发誓这样做。 |
| 9. | Take the pills two at a time . 每次服两粒。 |
| 10. | Each cow normally produces only one calf at a time . 在一般情况下,一头母牛每次只能产一头牛犊。 |