This truck is of unknown origin.
这辆卡车来历不明。
The debris, of unknown origin, passed by without incident last Tuesday morning.
这块不知来源的太空垃圾在上周二早上安全通过空间站附近，没有发生碰撞。
The truck is of unknown origin.
这辆卡车来历不明。
Objective To investigate the causes of fever of unknown origin.
目的探讨不明原因发热的病因分布特点。
Objective: To investigate the cause of fever of unknown origin (FUO).
目的：探讨不明原因发热(FUO)的病因。
Junk: Classic Chinese sailing vessel of ancient unknown origin , still in wide use.
中国式帆船：中国古代帆船，起源不详，但至今仍广泛使用。
Their language is of unknown origin and cannot be placed within any standard classification.
他们的语言起源不明，也无法被归入任何标准的类别。
Objective To study the origin and diagnostic method for children fever of unknown origin (FOU).
目的探讨不明原因长期发热(FOU)患儿的病因及诊断方法。
Objective To study the origin and diagnostic method for children fever of unknown origin (FOU).
目的探讨不明原因长期发热(FOU)患儿的病因及诊断方法。
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