Definition: a set of stairs and the structure around them Level: C1
这座豪宅有一座宏伟的大理石楼梯。
The mansion featured a grand marble ___staircase.
阁楼只能通过一个室外楼梯进入。
The attic is only accessible by an outside ___staircase.
他们匆忙从紧急楼梯下去了。
They hurried down the emergency ___staircase.
