If you remember Joe Biden's recent trip to China, you'll know that he owed Chinese Vice President Xi Jinping a USA tour.

Well, Joe paid his dues in sunny California.

He took VP Xi to the International Learning Studies Center to give the students a chance to brush up on their Mandarin -- while brushing shoulders with two prominent politicos.

Joe said that he believes schools like the one he visited could foster "mutual understanding" between countries like the U.S. and China.

We're always down to make and keep good friends so, we say, bring on the schooling!