You've been standing on what you think is the bottom step, but then you find out you're actually one step up from that.

你一直站在你认为是最基本的一步上，但你发现你实际上是在其还向上一步。

Well, that had to be risked. As she reached the bottom step, she heard the servants moving about in the dining room under the butler's orders, lifting out the table and chairs in preparation for the dancing.

她跑到楼下时，听见仆人们由膳事总管指挥着在饭厅里干活，主要是把餐桌和椅子搬出来，这晚上的舞会作准备。

He stepped slowly forward with outstretched hands, until his foot struck the bottom step; then he rapidly scaled the stairs, stood for a moment to compose his expression, lifted the arras and went in.

他伸出双手，缓步向前，直到脚踩到最下面的台阶；然后他飞快地爬上楼梯，站了一会儿，定下神色，提起阿拉斯走了进去。