| 1. | In eighteenth century the theory shrank . 在18世纪这种理论开始衰落。 |
| 2. | These theories drew analogies of them . 这些理论吸取了它们的相同点。 |
| 3. | In theory the plan should have worked . 按理论那个计划应该是有效的。 |
| 4. | The mathematics of the theory is too formidable . 理论中的数学太难。 |
| 5. | All the facts certainly fit your theory . 所有的事实当然符合你的理论。 |
| 6. | An example is the kinetic theory of gases . 一个例子是气体的运动理论。 |
| 7. | Your theory disaccords with my experience . 你的理论和我的经验不一致。 |
| 8. | Let us put his theory to the proof . 让我们来检验一下他的说法吧。 |
| 9. | His theories met with general discredits . 他的理论遭到普遍怀疑。 |
| 10. | Theory must not be divorced from practice . 理论与实践不能脱节。 |