Nearly all members of an ecosystem ultimately get their energy from plants, no matter if they're herbivores or carnivores.

几乎所有生态系统的成员最终都从植物中获取能量，不管它们是食草动物还是食肉动物。

This does not happen in the normal expansion of the universe in which the matter energy density goes down as the universe gets bigger.

这不会发生在正常的宇宙膨胀中，在正常膨胀中物质能量密度随着宇宙变大而下降。

Now twice zero is also zero. Thus the universe can double the amount of positive matter energy and also double the negative gravitational energy without violation of the conservation of energy.

现在两次零也是零。因此，在不违反能量守恒的情况下，宇宙可以使正物质能量加倍，也可以使负引力能量加倍。

In this case we're talking about matter so anything that occupies space that has a mass or that is related to energy so matter so all things in the world are made up of matter right exactly okay now.

在这种情况下，我们谈论的是物质，所以任何占据空间且具有质量或与能量相关的东西都是物质，所以世界上的所有事物都是由物质组成的，现在完全可以。