物质以三种形态存在：固态、液态和气态。

Matter exists in three states: solid, liquid and gas.

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第一种称为AncGR1，以450亿年前的原始形态存在。

The first, called AncGR1, existed in its ancestral form from about 450 million years ago.

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“暗物质”是一种以不可见的形态存在的物质，它构成了宇宙的大部分质量。

Dark matter is an invisible form of matter that accounts for most of the Universe's mass.

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We'll talk about some chemistry today, what DNA molecules are like, why they have the behavior that they do, and you need to understand this in order to understand how you manipulate DNA.

今天我们会谈到一些化学结构,比如DNA分子的形态,它们为什么会以这种形态存在,你必须先掌握这些,才能理解如何操控DNA

耶鲁公开课 - 生物医学工程探索课程节选