| 1. | The derivative of the step is the impulse .
阶梯的导数就是脉冲。 |
| 2. | She set her basket down on a doorstep .
她把篮子放在阶梯上。 |
| 3. | She stole down the stairs and passage again .
于是她重新悄悄走下阶梯和通道。 |
| 4. | They bolted down the gangway and took their tickets .
他们跑下阶梯，买好了票。 |
| 5. | The result is the staircase pattern shown in fig 6-22 .
结果就是图622展示的阶梯图形。 |
| 6. | Mankind commenced their career at the bottom of the scale .
人类是从发展阶梯的底层开始迈步。 |
| 7. | But he was about to blow up the ladder he was standing on .
但是他即将会毁掉他现在站立的这个阶梯。 |
| 8. | Libraries have however remained locked in their growth spiral .
然而，图书馆仍然处在不断增长的阶梯上。 |
| 9. | There was the dreadful shadow, pausing at the bottom of the steps .
那个怕人的影子还在那里，停在阶梯脚下。 |
| 10. | When the density step wedge has been properly exposed, the film is then processed .
当密度阶梯光楔被正确曝光后，即把胶片冲洗出来。 |
