Freedom of speech is one of the bottommost principles of democracy .

言论自由是民主的最基本原则之一。

Drills down the bottommost members of a set , at a specified level , to one level below .

将集中某一指定级别上的最底层成员深化到下一个级别。

On this bottommost layer , we include all of the faces of the graph casing that need to become " covered " when the graph is full or partially full .

在这个最背后的图层中，我们要做到的是让图片覆盖所有的图形区域，不论图形是填满的还是未填满的。