At one end stands a bench about three feet high.中At one 为什么用one?

At one end stands a bench about three feet high.中At one 为什么用one?
At one end stands a bench about three feet high.
中At one 为什么用one?

At one end stands a bench about three feet high.中At one 为什么用one?
At one end：在一边
one end是某一边的意思