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1·While there are signs that a mushroom is poisonous, they are not consistent, and all mushrooms of unknown origin should be considered dangerous to eat.

尽管有特征说明蘑菇是有毒的，但它们是不一致的，所有来历不明的蘑菇都应该被认为是有危险的食物。

2·This truck is of unknown origin.

这辆卡车来历不明。《新英汉大辞典》

3·The truck is of unknown origin.

这辆卡车来历不明。

4·TANGIBLE COMMON EQUITY, n., unknown origin.

有形普通股权益(TANGIBLE COMMON EQUITY)，名词，起源未知。

5·He told me it was a word of unknown origin.

什么…_百度知道他告诉我这是一个不知道来历的单词…

6·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。

7·A Valentines' Day story adapted from a folktale of unknown origin.

一个情人节的故事改编自民间故事的起源不明。

8·Or should I blame the 130k miles and seat stains of unknown origin?

还是应该归因于13万英里的行驶里程和不明座椅污渍？

9·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。

10·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。