| 1. | A duck ' s quack doesn ' t echo , and no one knows why
鸭子的叫声没有回音,没有人知道为什么。 |
| 2. | A duck ' s quack doesn ' t echo and no one knows why
鸭子的叫声没有回音可没有人知道为什么。 |
| 3. | In those days , though , no ? one knew why this happened
可是，那时候没有人知道为什么会发生这样的事。 |
| 4. | B : no one knows why . maybe he ' s offended by your words just now
没有人知道为什么.可能是你刚才的话冒犯了他 |
| 5. | Who knows the reason one leaf falls and another remains
没有人知道为什么有的树叶会飘落下来而有的树叶依旧长在树上？ |
| 6. | Nobody knows why there has been an unpleasant atmosphere in the office these days
没有人知道为什么这些日子办公室的气氛一直令人不快。 |
| 7. | And nobody knows why different cancers spread to particular tissues , such as why breast cancer travels to lung and bone in particular
没有人知道为什么不同的肿瘤扩散到不同的特定组织，就像为什么乳腺癌尤以肺和骨转移。 |
| 8. | No one knows for sure why these disparities exist . but a likely explanation is that the higher rates are seen among groups of people with more risk factors
没有人知道为什么这些差异存在，但一个可能的解释是，被观测的群体中高患病率的人有更多的风险因素存在。 |
| 9. | The benefit of this practice can be seen by thinking back on projects you may have heard about ( or even been a part of ) where the build process was weekly or less frequently , and usually led to " integration hell " , where everything broke and no one knew why
这个实践的好处可以通过回想你可能听说过的（或者是亲身参与过的）项目来了解：当系统构建是每周或以更低的频率进行时，通常会陷入“集成的地狱” ，在那里所有东西都不能运行而且没有人知道为什么。 |
