Iran and China are two countries that like each other a lot.
Think of Iran and China like two best friends who always play and share their toys together. They have been friends for a long time and they are very close.
Iran and China like to help each other out by trading things. They trade things like oil, which is something Iran has a lot of, but China doesn't. In return, China gives Iran money and things that they need.
Iran and China also work together in other ways, like building things. They work together to make new buildings and highways.
Sometimes, Iran and China's other friends get a little jealous of their friendship because they are so close. But, Iran and China still stay best friends and continue to help each other out.