| 1. | The earth revolves once a year around the sun .
地球一年绕太阳公转一次。 |
| 2. | Serpents cast their skin once a year .
蛇每年蜕一次皮。 |
| 3. | The moon reaches its absolute perigee once a year .
月球每年有一次达到它的绝对近地点。 |
| 4. | A festival for the dead is held once a year in japan .
在日本，人们一年一度过“亡灵节”。 |
| 5. | Whatever be your fortune, let me see you once a year .
无论你的遭遇怎样，让我一年见你一次。 |
| 6. | We will re-examine the nih guidelines at least once a year .
每年我们至少重新检查一次NIH标准。 |
| 7. | It is essential that the young trees be visited once a year for the first six or eight years .
幼树在最初的68年应每年检查一次。 |
| 8. | We resolved to visit europe at least once a year
我们决定至少每年访问欧洲一次。 |
| 9. | Regular meetings convened at least once a year
一定期会议，每年至少召开一次。 |
| 10. | 7 . meetings shall be held at least once a year
7 .该会每年须召开最少一次会议。 |
