But the acquisition of radioactive material for a so-called 'dirty bomb,' which is radioactive material that is dispersed with a conventional explosive device, that is not that challenging.

VOA: standard.2009.05.01

For days I had dreamed about a huge, white boat floating on a vast body of water, but when my mother took me down to the levee on the day of leaving, I saw a tiny, dirty boat that was not at all like the boat I had imagined.

那些天我总是幻想着一艘,巨大的白船徜徉在宽阔的河上，但当出发那天,妈妈将我带到岸边时，我只看到一只又小又脏的船,完全不是我想的那样，“

耶鲁公开课 - 1945年后的美国小说课程节选

You might say,the only way to explain the behavior is to say that at some level, he really does believe his hands are dirty, despite the fact that he says they're not.

唯一的解释也许就是，在某种程度上，他确实还是相信自己的手脏的，尽管他说它们不脏。

耶鲁公开课 - 死亡课程节选

And Charles Darwin actually, who was an astute observer of human behavior, tells a nice story to illustrate this: how "a native touched with his finger some cold preserved meat and plainly showed disgust at its softness whilst I felt utter disgust at my food being touched by a naked savage though his hands did not appear dirty."

达尔文，对人类行为观察入微，他有一个故事很好地解释了反感：,“一个土著用手指碰冷腌肉,那种软软的质地让他感到很反感,而让我感无无比反感的是我的食物,被一个没穿衣取的土著碰了，虽然他的手不脏“

耶鲁公开课 - 心理学导论课程节选