1.the bottom of ……的底部
At the bottom of the ladder we have only ignorance, and at the top we have knowledge.
在阶梯的最底层，我们是无知的。当我们到达顶端时，我们就拥有了知识。

2.be packed with 挤满；塞满
On a sunny day in Trinity term, the slow-drifting river would be packed with jostling punts full of rowdy students.
在夏季学期阳光明媚的日子里，这条舒缓的河流上会挤满了相互碰撞的平底船，里面坐着大呼小叫的学生们。

来源:可可英语 http://www.kekenet.com/Article/201705/508473.shtml