| 1. | And still the cause of the phocomelia outbreak remained unknown .
然而，畸形儿病例大量发生的原因不得而知。 |
| 2. | The longer you remain unknown to the police, the longer you'll be effective .
你不被警察发现的时间愈长，那你的实际作用就愈大。 |
| 3. | President nixon devalues the dollar, journeys to beijing and moscow; the future remains unknown .
尼克松总统使美元贬值，到北京和莫斯科去旅行；未来还处于未知中。 |
| 4. | The underlying reason for the failure remains unknown
失败的根本原因尚未搞清。 |
| 5. | The fate of one sister , pepi , remains unknown
目前仍有一个叫皮皮的姐姐下落不明。 |
| 6. | The true author of this novel still remains unknown
这部小说的真实作者还是不为人知。 |
| 7. | The motives of the monk remain unknown
和尚真正的意思无从得知 |
| 8. | Who let out the secret remains unknown
谁泄了密还未查出。 |
| 9. | Despite many years of research , the cause of fic remains unknown
尽管研究多年，仍旧无法得知此病的起因。 |
| 10. | But , they say , exactly how the two are connected remains unknown
但是更为准确的两者之间的必然联系，仍然未知。 |
