在两个国家结婚,实际上就是省的互相送三级公证把外国结婚事实送到中国(以便卖房等等)。婚姻只有一个,不是两个,所以只需要一次离婚。
Lastly, you only obtain a divroce at the place of your residency. You don't need to go to the place of marriage to obtain a divorce.