The main evidence of its existence is based on the absence of a large amount of antimatter in our universe.

这种理论的主要证据是基于我们的宇宙中没有大量的反物质。

The main evidence for their presence consists of impression on pottery, where a cereal grain accidentally became embedded in surface of a pot before it was fired.

它们出现的重要证据来源于陶器上的压痕，谷粒在陶器没有烧制之前碰巧嵌在表面。