And he had seen days of no food and empty stomachs, days when the fish did not come, and the animals were hard to find.

VOA: special.2010.02.27

It appears to be useful in that way but I imagine it does more compelling things these days but I have not seen it myself.

那样看起来仿佛比较有效果,但我想这些天它非常引人注目,只是我自己没看到而已。

哈佛公开课 - 计算机科学课程节选