Books made of papyrus were unknown to the Mesopotamians.

人们在美索不达米亚不曾发现过莎草纸书。

The ordinary feelings which make life amiable and indolent, were unknown to him.

赋予生命以和蔼和懒惰这些特质的正常情感，他无从知晓。

D) It has a chemical structure unknown to scientists.

D）它具有科学家未知的化学结构。

So the southern right whale is still unknown to you.

那么，南极的鲸鱼对您来说还是陌生的。

There is unknown to us is an alien would be.

我们不知道外星人会是什么样子。

Unknown to each other, both adopted families named adopted sons James.

不认识彼此的前提下，两户人家都给孩子起名James。

The great majority of organisms on Earth remain unknown to science.

科学家对于地球上大多数的有机体都是一无所知的。

" There are too many unknowns to make a reasonable valuation, " Arenillas notes.

“这里有太多的未知因素了，所以很难做出合理的估值。”

There's a lot that happens here that's unknown to the outside world.

那里发生了很多外界不知道的事。

What happened in the world before that time is all unknown to me.

在那以前，对世界上发生的任何事情，我一无所知。

There's a lot of unanswered questions that still remain unknown to us.

有许多未解的问题我们仍然不知道。

Though unknown to many Americans, the retired brain surgeon is a conservative pin-up.

尽管对于很多美国人来说还很陌生，这位退休脑外科医生是保守党的招牌人物。

Which means this bump could represent a new particle previously unknown to scientists.

这意味着这次“撞击”可能代表着科学家们前所未知的一个新粒子。

Unknown to Chevron was that one of those bodies was actually still alive.

雪佛龙公司不知道的是，其中一具尸体实际上还活着。

Polo told of many amazing things that were unknown to Europe, such as paper money.

马可·波罗讲到的许多神奇的东西在欧洲是闻所未闻的，如：纸币。

By accident, they contained something unknown to myself or to the chemist that prepared them.

意外的是，它们包含了一些对我和药剂师而言未知的药物。

This ability may explain why it remained unknown to science until 1998.

这种能力或许可以解释为什么直到1998年它们才被科学发现。

What he would find revealed a second deep sea monster, one previously unknown to science.

他发现的东西揭示了第二种深海怪物，此前不为科学界所知的。

The deepest parts of the ocean are totally unknown to us.

海洋深不可测的底层，我们完全不了解。

He had no idea that lying nearby was a second species, unknown to modern science.

他根本不知道另一个不为现代科学所知的物种就在不远处。