We walked down the
staircase.
我们走下了楼梯。
Mary climbed the
staircase cautiously, holding fast to the rail
玛丽紧紧地抓着栏杆，小心翼翼地爬楼梯。
Next to the building's staircase is a new energy meter installed last year, a game changer for about 150 students studying here.