There's no knowing how he'll react.

很难预料他会有什么样的反应。

《牛津词典》

Nations react strongly to unauthorized overflights.

各国对于未授权的飞越领空反应强烈。

《柯林斯英汉双解大词典》

I nudged her but she didn't react.

我用胳膊肘捅了她一下，可她没有反应。

《牛津词典》

He or she is unconscious -- unable to communicate or react to surroundings or speech.

VOA: special.2010.08.17

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

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

Yebawa didn't react -- his eyes stared off into the distance.

CNN: Slave master becomes an abolitionist

Much depends on how consumers react -- confidently, or fearfully.

CNN: Amid economic turmoil, inklings of optimism

And they simple don't know how the ECB would react - whether it would do something that central banks are never supposed to do, which is provide unsecured loans, or whether it would allow the bank to fall over, and risk a chain reaction of collapsing banks.

BBC: Business