| 1. | Ab extends by 2mm and bc contracts by 2mm .
AB伸长2mm，而BC缩短2mm。 |
| 2. | The line ab intersects the line cd at e .
直线AB与直线CD相交于E点上。 |
| 3. | The angle is contained by the lines ab and ac .
此角由直线AB和AC构成。 |
| 4. | The lines ab and cd intersect at e .
直线AB与直线CD相交于E点上。 |
| 5. | Then we exclude elements a and b then we include again the ab .
然后去掉A和B的元素，再重新包含AB的元素。 |
| 6. | We use juxtaposition to denote conjunction, ab means both a and b .
我们利用并列表示合取，AB意味着A与B两者。 |
| 7. | The tube abc shown is cantilevered with ab and bc in a horizontal plan .
所示的管ABC是由位于同一水平面内的AB和BC组成的悬臂。 |
| 8. | This recording was taken on weathered outcropping limestone with a relatively short ab (40m) .
这是在风化的灰岩露头上用较小的AB距（40m）记录的。 |
| 9. | This recording was taken on weathered outcropping limestone with a relatively short ab (40m) .
这是在风化突出的石灰石上用较小的AB踞（40m）记录的。 |
| 10. | the vertical displacement =1mm is normal to the bars ab and bc and hence does not affect their length.
竖向位移1mm垂直于AB和BC，故不影响它们的长度。 |
