| 1. | It is difficult to obtain reliable evidence . 这很难取得可靠的凭据。 |
| 2. | The contact resistance is difficult to measure . 接触阻力很难测量。 |
| 3. | Sundays were difficult to get through . 每个星期日都很不容易打发过去。 |
| 4. | His work is difficult to label accurately . 他的工作很难准确归类。 |
| 5. | Yet traditions are difficult to displace . 但传统习惯却很难改变。 |
| 6. | It used to be difficult to get drinking water here . 过去这里吃水很困难。 |
| 7. | It is difficult to get rid of deep-rooted habits ... 积习难除。 |
| 8. | It is difficult to make friends with her . 跟她交朋友十分困难。 |
| 9. | It is difficult to breathe at these altitudes . 在这些高的地方呼吸感到困难。 |
| 10. | It is difficult to be natural when one is tense . 人在紧张的时候很难泰然自若。 |