My uncle has always been (as) mad as a hatter, always coming up with the wildest ideas.

我叔叔一直都瘋瘋癲癲的，總是想出最瘋狂的主意。

After working non-stop for three days, he was (as) mad as a hatter.

連續工作三天後，他已經瘋瘋癲癲的了。