staircase
n. 楼梯;<英>(尤指中小学和大学建筑物中的)楼梯间
复数 staircases
例句
He groped his way up the staircase in the dark.
他摸黑走上楼梯。
《牛津词典》
She was sitting on the bottom step of the staircase.
她正坐在最下面一磴楼梯上。
The house has a superb staircase made from oak and marble.
这座房子里有用栎木和大理石做成的一流的楼梯。
《柯林斯英汉双解大词典》