http://dict.bing.com.cn/ is a greate online translate tool which I use every single day.
However, I'm tired of the select - copy - open a new tab - paste - press Enter process. So I write this chrome extension.
All you need to do is to select the text and right click your mouse, click C3PO, a new tab containing the translation will be created.
I love C3PO as much as R2D2.