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。