A problem called North Korea的用法和样例：
- Obama called North Korea's possible elevation to nuclear power "unacceptable," and Lee said, "Under no circumstances are we going to allow North Korea to possess nuclear weapons.
- National Georgrahpy Channel used to have a problem call "Dog Whisperer".
- If you don't you could damage your eyes and develop a problem called Carpal Tunnel Syndrome in your wrists.
- A unit of currency in North Korea and South Korea.
- Secretary of State Hillary Clinton is calling North Korea's plan to fire a missile a provocative act that would have consequences.