It's a local custom to eat rice dumplings in June.
在六月吃粽子是當地的習俗。
My family has a custom of having tea after dinner.
我家有晚餐後喝茶的習俗。
Many customs are different between Taiwan and Japan.
台灣和日本之間有許多不同的習俗。
Shaking hands is a common custom in many countries.
握手是在許多國家常見的習俗。