经过彻底的调查，许多专家现在认为，这条轨迹是一条普通的喷气式飞机尾迹。
After a thorough investigation, many experts now believe that the streak was a run-of-the-mill jet aircraft contrail.
经过彻底的调查，许多专家现在认为，这条轨迹是一条普通的喷气式飞机尾迹。
After a thorough investigation, many experts now believe that the streak was a run-of-the-mill jet aircraft contrail.
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