| 1. | It rained on and off all day .
哩哩啦啦下了一天雨。 |
| 2. | Rebecca and i had lived together on and off for years .
我跟贝丽卡时作时辍地一起生活了好多年。 |
| 3. | Is it something you can turn on and off like a faucet ?
这是不是象自来水龙头，你要开就开，要关就关？ |
| 4. | Quite a few years on and off . i know a number of words and good phrases .
断断续续学好几年了，初步掌握了一些单词和常用的短语。 |
| 5. | Sparks were emitted from small black boxes and red lamps flashed on and off angrily .
黑色的小盒子放出火花，红灯刺眼地忽亮忽灭。 |
| 6. | The boat, which was swinging in an eddy, came on and off and pitched with violence .
飘荡在旋涡里的渡船，一上一下猛烈地颠簸起来。 |
| 7. | Imagine what a complicated mechanism it must take to keep all those lights blinking on and off at the right times .
让那些灯光照规定时明时灭，你想真是一个构造复杂的机械。 |
| 8. | It is inconceivable that so strong a source of energy can be switched on and off in as little time as 1/30 second .
真难以想象如此强的能源可在130秒这样短的时间内关闭和开启。 |
| 9. | I have been studying english on and off for 4 years
我断断续续学了四年英语了。 |
| 10. | Keep pressing ctrl k to toggle a bookmark on and off
按住ctrl k切换书签开关。 |
