staircase
楼梯

例句：
Old people must be very careful as they climb a staircase.
年长的人在上楼梯时，必须得小心。

make a scene 
出洋相

例句：
Don't make a scene! We'll discuss this when we get home.
别在这里出丑, 这问题我们回家再谈。

How often do you see her?
你隔多长时间去看她？

例句：
A: How often do you see her?
B: About three times a month.

A：你多长时间去看她一次？
B：一个月大约三次。