I love this!
there's a very good web app (it works on mobile browser as well, but no native app) on japanese. please someone make a mandarin version that works like this http://nihongomaster.com/
I love this!
there's a very good web app (it works on mobile browser as well, but no native app) on japanese. please someone make a mandarin version that works like this http://nihongomaster.com/