NASA used its Lunar Crater Observing and Sensing Satellite,or LCROSS, to look for water deep beneath the lunar surface.

VOA: special.2009.12.30

So I haven't done magic, I've given you a really fast way to solve a knapsack problem, but it's still exponential deep down in its heart, in something.

所以我并没有施魔法，我已经告诉了你,一种快速解决背包问题的方法了,但是某些方面它的核心仍然是指数增长的。

麻省理工公开课 - 计算机科学及编程导论课程节选

"It is also a very deep crisis, its not just a wide lake - there is also depth to it."

VOA: standard.2010.03.01

"This capability allows the Strike Eagle to fly undetected, deep into enemy territory and deliver its ordinance."

VOA: standard.2009.11.15