Deep brain stimulation begins by doctors drilling two small holes in the head of the patient.

VOA: special.2009.02.03

These constitute two irreconcilable alternatives, two different callings, so to speak, and any attempt, I think, to reconcile or to synthesize these two can only lead to a deep injustice to each.

这包含了两种无法调和的准则，两种不同的召唤，可以说任何想要，调和或综合两者的意图,仅会导致双方皆产生深度的不义。

耶鲁公开课 - 政治哲学导论课程节选

Seeds should be planted two and one-half centimeters deep.

VOA: special.2009.03.24

He tested the free-diving self-propelled submersible - one of only two in existence at the time - on increasingly deep dives off the California coast.

VOA: standard.2010.06.21