We would expect only to see primitive life forms.

我们只能期待看到原始的生命形式。

He designed many new inventions, including a primitive form of a helicopter and a tank.

他设计了很多新的发明，包括直升机和坦克的原型。

And bacteria, primitive forms of life, have been seen there.

那里曾出现过细菌这种原始生命形式。

Could Mars have supported its own primitive, aquatic life forms?

火星能支持它自己的原始水生生命形式吗？

There are, however, other primitive forms of life that can flourish under such conditions.

然而，在这种条件下，还有其他原始生命形式可以繁衍生息。

For the traditional " noble robber" represents an extremely primitive form of social protest, perhaps the most primitive there is.

因为传统的“贵族强盗” 代表了一种极其原始的社会抗议形式，也许是最原始的一种。

But, if you have an actual demonstration article, even if it’s in primitive form, that’s much more effective in convincing people.

但是，如果你有一篇实际的演示文章， 即使它是原始形式，也能更有效地说服人们。

Like a family tree, with the most primitive ancestral forms at the trunk, evolving into more derived species on the branches.

就像一棵家谱，在树干上有最原始的祖先形态，在树枝上演化出更多的派生物种。

But now, places have been found on earth that are in total blackness, such as caves several miles beneath the surface, and bacteria, primitive forms of life, have been seen there.

但是现在人们在地球上一些完全暗无天日的地方也发现了细菌等原始的生命形式，比如地面几英里以下的洞穴中。

But in the fossil record, there are examples of teeth that look just as he predicted and we can trace the molars of all living mammals back to that primitive form.

但是化石记录显示，有些牙齿样本与他推测的一样并且所有哺乳生物的臼齿，也可以追溯到那个原始形式。

The unconscious desire is in no way mysterious; it is the natural primitive form of desire, from which the other has developed through our habit of observing and theorizing (often wrongly).

无意识的欲望一点也不神秘；它是欲望的自然原始形式，另一种是通过我们观察和理论化（通常是错误的）的习惯从中发展而来的。