Dear Li Ming,
I know you are going to spend your summer holiday in Japan. Yesterday, I read a book about Japanese body language. Now let me share something with you.
When people meet in Japan, they don't shake hands. They bow to each other. And look at OK gesture. For us, it means everything is OK or good. But it means money for the Japanese. When people in Japan want to say OK or something is good, they shape their arms above the head into a big "O".
That's all. And I hope you have a great holiday.