| 1. | They set the limits of performance attainable .
它们确定着可达到的运行限度。 |
| 2. | It can operate without human intervention .
它可以在没有人为干涉的情况下运行。 |
| 3. | Do n't open the door while the train is in motion .
列车运行时，请勿打开车门。 |
| 4. | "will the train keep on the lines? "
火车能正常运行吗？ |
| 5. | We can draw the earth 's orbit round the sun .
我们可以画出地球绕太阳运行的轨迹。 |
| 6. | The earth revolves round the sun .
地球环绕太阳运行。 |
| 7. | The moon revolves around the earth .
月球绕地球运行。 |
| 8. | The earth is one of the planets revolving round the sun .
地球是绕太阳运行的行星之一。 |
| 9. | Take the car for a trial run to see if you like it .
试试运行那辆汽车，看看你是否喜欢。 |
| 10. | Scientists are carefully charting the progress of the spacecraft .
科学家密切跟踪航天器的运行。 |
