For some unknown reason, many were discarded, often still intact, and thousands have been found all over the Near East.

由于一些未知原因，很多被丢弃的物品还是被完整地保存下来了，而在近东的各地有上千件这样的物品出土。

youdao

You may not have the fear of death, but all the other fears are still there: the fear of the unknown and the fear of failure.

你也许不会有对死亡的恐惧，但是所有其它的恐惧却时刻在你身边：对无知的恐惧，对失败的恐惧。

youdao

The creator of Stuxnet is still unknown, but with the sophistication of the code and the heavy amount of insider knowledge required, all signs point to a state or group of states.

Stuxnet的编写者至今未知，但是从编码的复杂程度和所需要的知识量来看，所有的信息都显示是一个国家或者一个国家组织所为。

youdao

The wildcard in all of this is Rose, whose return is still unknown although he has been practicing with the team.

WSJ: Lopez, Blatche help Nets hold off Pistons, 103-99

Even proponents say the clinical significance of nearly all of the millions of mutations found in a person's DNA is still unknown.

WSJ: Making Gene Mapping Part of Everyday Care

While that may not match the hordes who flock to Glastonbury, it is still remarkable in a country where western-style rock music was all but unknown until about 20 years ago.

BBC: Rocking out in Beijing