| 1. | We were all pinned down by enemy fire .
我们都被敌人的火力压制住了。 |
| 2. | She is a difficult person to pin down .
她这人行事、说话没个准儿。 |
| 3. | He was pinned down by his attackers .
袭击他的人把他按住了。 |
| 4. | It was difficult for me to pin down the subject .
对我来说，要弄清楚这个问题很困难。 |
| 5. | The identity of each sex is not so easy to pin down .
确定男女各自的特征并不那么容易。 |
| 6. | To pin down the size of an orbital, we take a contour surface .
为束缚住轨道的大小，我们取一等值面。 |
| 7. | He is as slippery as an eel and simply refuses to be pinned down on anything .
他很圆滑，什么事情都不肯承担责任。 |
| 8. | The task of their regiment was to pin down one of the flanks of the invading army .
他们团的任务是牵制侵略军的侧翼。 |
| 9. | They plan further work in the area to try to pin down the factors responsible .
他们打算在这一地区再做些工作以期确证这些起作用的因素。 |
| 10. | It is never possible nowadays to pin down any date within a year or two .
要把任何日期确定下来，误差不出一两年，在当今的时世里，是永远办不到的。 |
