stair 楼梯;梯级； 复数形式是stairs. 例句She took the stairs at a run. 她跑着上了楼梯。 1.I heard his heavy tread on the stairs. 我听到他在楼梯上...
stair是楼梯、阶梯的意思，是可数名词，复数是stairs. 例句 She took the stairs at a run. 她跑着上了楼梯。 She descended the stairs slowly. 她缓慢地...
