spiral staircases 螺旋楼梯
stone staircases 石头楼梯
grand staircases 宏伟的楼梯
A: Are these staircases made of marble?
A：这些楼梯是汉白玉做的吗？
B: No, they are made of solid oak.
B：不，它们是由实心橡木做的。
1) 楼梯（复数）
2) 阶梯结构
1. 楼梯
noun
1. Sets of steps used for walking from one floor of a building to another.