目前还不清楚

• The fbi says it does not know if foul play was involved
  美国联邦调查局称目前还不清楚是否与谋杀有关。
• The investigation was going on
  事故的原因目前还不清楚
• The investigation was going on
  事故的原因目前还不清楚
• What involvement john holmes may have had in the murders is still unclear ,
  John holes和此案有什么联系，目前还不清楚
• It is not clear yet when the teachers on strike will return to their classrooms
  目前还不清楚罢课的教师何时会回到教室去。
• It is not yet clear who sent these particular bombers or whattheir motivation was
  目前还不清楚这些恐怖分子是谁派来的和他们的目的是什么。
• A fifth candidate sgr has gone off only twice ; its precise location is still unknown
  第五颗疑似sgr的星体只爆发过两次，精确位置目前还不清楚。
• It was unclear how the 300 - pound female siberian tiger escaped or how long it was on the loose
  目前还不清楚这只300磅的西伯利亚虎是何时如何出逃的。
• The mechanisms behind the association between obesity and parkinson ' s disease risk are unclear
  肥胖症和帕金森病风险之间联系的潜在机制目前还不清楚。
• It ' s not yet clear whether the technique can surround legal restrictions on federal funding
  这项技术是否能够摆脱法律的限制，得到联邦的资助目前还不清楚。