句首有as with怎么意思？？

as with 与...一样
Smiling, as with happiness or optimism.
满面春风的微笑，如带着欢悦的或乐观的
as for
至于,关于
As for you, I refuse to have any dealings with you.
至于你,我不想跟你打任何交道。
as to
a. 就...而论(至于,说到)
We left for the station so early as to catch the first train.
我们很早就动身去车站以便赶上头班火车。

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