You can say "上楼来" (shang lou lai). "Stair" means "楼梯"(lou ti ) in Chinese.
Shang
I would say that they have a rise over run (just like slope). So say that a stair goes up 2 feet every stair across, it's slope would be 2/1 or 2 (but i could be totally wrong).
A stair stringer is what holds up the stairs. Usually, a staircase has at least two of these supports to hold it up.
"向上" or "上"
fotune cookie
Stair climb not easy when go up.
The girl quietly tiptoed up the stair in her stocking feet.
起立Qǐlì
fire works were invented by Chinese
Did your dog come up missing?
"meet up" in chinese is pronounced as "ou yu",is writen as "偶遇"
it may come from some dinosaur bones that were dug up and mistook for dragons