unidentified track

例句：

1. 1. The team spent hours analyzing the unidentified track to find a solution.
   团队花了数小时分析这条未识别的轨道来寻找解决方案。
2. 2. The unidentified track was so complex that it took months to decipher.
   那条未识别的轨道非常复杂，需要数月时间才能破解。
3. 3. The researchers were unable to identify the source of the unidentified track.
   研究人员无法确定这条未识别的轨道的来源。