at the top of：

1.I waited at the top of the stairs. 我在樓梯頂端等著。

2.He stopped at the top of the stairs. 他在樓梯頂端停了下來。

3.They paused at the top of the stairs, doubtful as to which way to go next 他們?cè)跇翘蓓敳客Ｗ×耍恢澜酉聛碓撏倪呑摺?/p>