| 1. | The chemical beds are provided in duplicate .
化学垫是成对设置的。 |
| 2. | Folds commonly show a pairing of crests and troughs .
褶皱通常显示出成对的脊与糟。 |
| 3. | The guests came in couples .
客人们成双成对地来了。 |
| 4. | Poles always exist in pairs .
磁极总是成对存在的。 |
| 5. | After dinner the boys and girls paired off and went to dance .
会餐后，男女青年们成双成对地去跳舞。 |
| 6. | As the couples closed upon him he expressed his congratulations .
当那些成双成对的人走近他时，他向他们表示了祝贺。 |
| 7. | The transverse fibres or commissure unite the two ganglia of a pair .
横行的纤维即接索则把成对的两个神经节连在一起。 |
| 8. | Values were derived from the duplicate 12 x 3-in. specimen compliances.
该值是由成对的12英寸X3英寸试样的柔度得来的。 |
| 9. | These atoms recombine in pairs during the night to form molecules of oxygen gas .
在夜间，这些氧原子再成对地结合成氧气分子。 |
