At the base of the hair root is a small ball-like formation called a bulb.

VOA: special.2011.04.05

And these tree trunks were the chords and at the base of each of these chords at least conceptually, theoretically, is this thing called the root.

这些树干就是和弦，而每个和弦的底部，从理论上说，就是被称为根的东西。

耶鲁公开课 - 聆听音乐课程节选

The abandonment of such a study or its adulteration for current political purposes would be a terrible loss for all of humanity, and at the base, at the root of that civilization stood the Greeks.

如果出于政治的目的而对此段历史,视而不见甚至完全摒弃,这对全人类,将是一个巨大的损失,追根溯源,这一切都根植于希腊文明

耶鲁公开课 - 古希腊历史简介课程节选

As the military considers sweeping changes for women, a senior Air Force leader told a House panel examining a sexual-abuse scandal at a Texas base on Wednesday that his branch of the military needs to improve its culture to root out problems, such as binge drinking and vulgar images, that can be conducive to sexual harassment.

WSJ: Panetta to Open Combat Roles to Women

And now the entire region is threatened because of radical extremists who have taken root in Somalia, taking advantage of what they perceive to be a failing state, to use that as a base to launch attacks, most recently in Uganda.

WHITEHOUSE: Town Hall with Young African Leaders