as没有然而的意思。

adv. 如同，像……一样

prep. 作为以……身份当作像，如同当……时

conj. 因为，由于在......时，随着以……的方式，像正如虽然，尽管I meant it as a joke.

这话我只是当作玩笑讲的。

Ebola is not as easily spread as viruses such as smallpox.

埃博拉病毒不像天花这类病毒那样容易传播。

You're as tall as your father.

你和你父亲一样高。

It's not as hard as I thought.

这没有我想象的那么困难。

Her skin was as smooth as silk.

她的皮肤像丝绸一样光滑。

He's nearly as tall as you are.

他差不多和你一样高了。