From the fourth days of the end

I'm a Chinese. I have learned in English a few years ago. But I can't use it in the company now. I had almost forgotten about it. Actually, I went to a Japanese company six years ago. I got Japanese language well(business level). Recently, I got an offer from an American company. I think I can challenge my English again. This is a big chance of my life to know other country's cultures and customs. I'll do my best to this.

 I wouldnt use "in my life" ,that's why I errased it :)