| 1. | It moves, it vibrates backwards and forwards . 它在运动,前后震动。 |
| 2. | She was always coming backwards and forwards . 她经常来来往往。 |
| 3. | He took up the knife and drew it backwards and forwards over his throat . 他便拿起刀,在他的喉咙前面划来划去。 |
| 4. | It is true that system could oscillate backwards and forwards in this dead zone . 不过,系统在这个死区内可能会发生来回的振荡。 |
| 5. | They know that periodic table backwards and forwards . 他们能把元素周期表倒背如流. |
| 6. | They know that periodic table backwards and forwards . 他们能把元素周期表倒背如流. |
| 7. | He understood automobile engines backwards and forwards 他对汽车发动机了解得一清二楚。 |
| 8. | Four - hour sweeps , backwards and forwards 之前或之后4小时 |
| 9. | He lit the gas and began to pace backwards and forwards 他点燃了煤气炉,然后开始来回地在地上踱着步。 |
| 10. | He looked backwards and forwards to see if anyone was following him 他前后张望着,看是否有人在跟踪他。 |