So we've got this complex form.

现在我们回到这个复杂的曲式上。

That was a time before complex life forms appeared on Earth.

那是地球上出现复杂生命形式之前的一段时间。

From these he can go on to appreciate more complex forms of combinations of several forms.

从这些形体出发，观赏者可进一步观察更为复杂的形体或若干形体的组合。

When you join live classes on our YouTube channel, make sure to practice these complex forms of grammar.

当你加入我们 YouTube 频道的直播课程时，一定要练习这些复杂的语法形式。

Some scientists count these as the first complex life forms.

一些科学家将它们视为第一个复杂的生命形式。

By using a variety of complex sentence forms, your writing will become more versatile and elegant.

通过使用各种复杂的句型，你的写作将变得更加多变和优雅。

Scientists speculate that in the RNA World, self--replicating RNA molecules evolved and eventually gave rise to more complex life forms.

科学家推测，在RNA世界中，自我复制的RNA分子不断进化并最终产生了更复杂的生命形式。

Girard-Buttoz said of the chimpanzee calls, " It is not a language but it is amongst the most complex forms of communication described in a non-human animal."

吉拉德-巴托斯谈到黑猩猩的叫声时说：“它不是一种语言，但它是非人类动物中最复杂的交流形式之一。”

Having prepared the way for more complex life forms, they were then grazed out of existence nearly everywhere by the very organisms whose existence they had made possible.

在为更复杂的生命形式创造条件以后，它们接着几乎在哪里都被别的生物挤出局，而那些别的生物的存在恰恰是它们使之成为可能。

And so we think that life would have experimented with this idea of going from being very simple single cell organisms to more complex life forms at least twice.

因此我们认为，生命至少有两次尝试从非常简单的单细胞生物体进化到更复杂的生命形式。

During the Stone Age, early hominins were believed to have developed complex forms of social transmission to communicate how to make better tools, tools for our survival.

在石器时代，人们相信早期人类已经发展出复杂的社会传播形式，以传达如何制造更好的工具，以维持我们的生存。

Membranous glomerulonephritis most commonly affects caucasian adults, and it can be primary, or idiopathic, meaning it's not quite clear why these complexes form, and this accounts for the vast majority of cases.

白种人最易患膜性肾小球肾炎，它可以是原发的，即特发性的，意味着免疫复合物形成的机理尚不明确；极大多数膜性肾小球肾炎病因属于这类。

As Evan Eichler, a geneticist at the University of Washington, told a press conference: " There are complex forms of genetic variation where we know the existing technology doesn't do a good job… it misses about two-thirds of those."

正如华盛顿大学的遗传学家埃文·艾希勒在一次新闻发布会上所说的那样: “我们知道，现有技术无法很好地研究复杂形式的遗传变异… … 它遗漏了大约三分之二的变异。”