My best challenging challenge in life is that I decide  decided working in overseas country.
actually when I was starting started a work. I can not speaking  speak english well
so I was  afraid to meet   met a new people and go to another country, but I thought this chance is was  only one time in my life once in a life time, anyway now I am  working in malaysia and I have a lot of foreigners friend like indian, chines, local and so on
even though I can not speaking  speak english well still until now, I study english continuously
and try to learn chines language for my work and my foreigner friend.
actually I encounter challenging  challenges every day. I don't am not  afraid anymore.
because I have  already have big experience about challenging. in mmy life