追【zhuī】
1. chase after; pursue 2. trace; look into 3. court; woo; pursue
[动]1、加快速度赶上 2、事后调查 3、努力达到目的

孩子追着蝴蝶跑。
The children are chasing after the butterflies.

我们要把事情发生的原因追查清楚。
We must look into the cause of the incident.

李教授不追名逐利,潜心做研究。
Professor Li devotes himself to the study and has no desire for personal fame and gain.
追查【zhuī chá】
investigate; track down (information); find out
[动]追究查问;事后调查

这起重大安全事故,必须追查责任。
The responsibility for this catastrophic accident must be found out.