2 sentences

1. 我们现在看到的是连锁反应。

   wǒ​men xiàn​zài kàn dào de shì lián​suǒ​fǎn​yìng.

   What we're seeing now is a chain reaction.

   Source: OpenSubtitles

2. 恐惧是大脑中的一种连锁反应。

   kǒng​jù shì dà​nǎo zhōng de yī​zhǒng lián​suǒ​fǎn​yìng.

   Fear is a chain reaction in the brain.

   Source: CCMatrix