There are only minutes - sometimes seconds - to react, and the incoming weapons are traveling faster than the speed of sound.

VOA: standard.2010.03.26

It is 1.7475. Conclusion: if I start to react sodium with chlorine, the result is a crystal, a three-dimensional array.

这是1。7475，结论就是：,如果我使钠和氯反应，结果将会是一个晶体，一个三维排列。

麻省理工公开课 - 固态化学导论课程节选

The the Afrikaaner Resistance Movement (AWB), which the 69-year-old farmer helped found in 1973,vowed revenge, but says it will not react violently.

VOA: standard.2010.04.05

I think the way that they might react to his presence-we'll see how that is-probably a positive reaction, should resonate in the Arab media, and that should be positive,"

VOA: standard.2009.05.09