: that
I don’t know as how your plan would be any better than mine.
我不知道你的计划哪里比我的好。
Seeing as how things were getting worse [=because things were getting worse], she decided to do something.
鉴于情况变得越来越糟，她决定做点什么。
(US, informal) She allowed as how the situation was serious. [=she admitted that the situation was serious]
她承认形势严峻。