上楼是go upstairs 或者 go up. 下楼是go downstairs 或者 go down.
我的朋友开车带我出去玩,My friend is driving to my house to pick me up for an outing.
她开车到我们小区的时候,When she arrives at my neighborhood,
就打电话给我,she gives me a call.
我听到电话响了不用接听就下楼去找她,When I hear the phone ring, I don't have to answer it. I just go downstairs to look for her.
她也就不用上来了。 That way, she also doesn't have to come up (to get me).