Jews who are descendants of the priestly caste of Aaron, the first High Priest in the Bible, covered their heads with prayer shawls and raised their hands to bless the congregation.

VOA: standard.2010.04.01

I want my children to be able to hold their heads high as Americans.

我希望我的孩子,作为美国人，能够昂首挺胸。

普林斯顿公开课 - 国际座谈会课程节选

Some of you might be saying in your heads, wait a second, I happen to know, I happen to remember from high school, p have different energies then, for example, s orbitals.

有些人,可能会心里想：,等等，我记得，高中的时候学过，轨道，that，p，orbitals,和s轨道，的能级是不同的。

麻省理工公开课 - 化学原理课程节选