| 1. | He used to run guns across the border .
他过去经常偷运枪支过境。 |
| 2. | To overcome these obstacles has always been and continues to be a major challenge to aviation .
怎样克服这些障碍，过去经常是，而且现在仍然是航空界的重要难题。 |
| 3. | A few doors farther on he found another ancient rendezvous and incautiously put his head inside .
再过去几家门面，他发现另一个过去经常光顾的场所，于是冒失地探头进去。 |
| 4. | “ i used to make up stories that they were
“我过去经常想给他们编编故事。 ” |
| 5. | I used to idle away the hours watching tv
我过去经常把时间浪费在看电视上 |
| 6. | She used to carol cheerfully every morning
她过去经常每天早上欢乐地歌唱。 |
| 7. | They used to be compelled to work 12 hours
他们过去经常被迫工作12小时。 |
| 8. | He used to smoke a pack of cigarettes a day
他过去经常一天抽一包香烟。 |
