No. 2 engine intensive vibration (severe vibration), reason unknown, we might shut down engine anytime.
第二发强烈抖动(严重抖动)，原因不明，我们随时可能关闭发动机。
He was trying, for some unknown reason , to count the stars.
不知何故，他试图数星星。
When I returned there last April, the dragon's head has collapsed for unknown reason.
去年四月，当我回到那儿，这条龙的头部由于不明原因而倒塌了。
The reason why they changed the plan is unknown.
他们改变计划的原因并不清楚。
The reason why she did it is still unknown.
她为什么做那件事的理由仍然不被人知。
The network is not ready for some unknown reason. Please try again shortly.
由于未知原因，网络尚未准备好。请稍后再试一次。
The reason why she refused my help is unknown.
没人知道她拒绝我的帮助的原因。
The reason why he did it is unknown.
他做那件事的理由不得而知。
The reason why he was punished is unknown to us.
他受惩罚的原因我们都不知道。
The reason for his absence is still unknown.
他缺席的原因还不清楚。
Several years ago a rare species of bird for some unknown reason.
几年前，因为某种无人知晓的原因，这种稀有的鸟绝迹了。
The reason for building the pyramids in Egypt is still unknown even today.
建造埃及金字塔的原因迄今仍不为人知。
The reason why he was late is unknown yet.
他为什么迟到的原因不清楚。
Thee reason why she refused my help is unknown.
没人知道她拒绝我的帮助的原因。
The reason for his going to France was unknown.
无人知晓他去法国的原因。
The reason for his going to France was unknown.
无人知晓他去法国的原因。
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