in the process of (doing something or happening); while (doing)[cedict]
打
dáㄉㄚˊ
dǎㄉㄚˇ
dozen[cedict]
to beat; to strike; to hit; to break; to type; to mix up; to build; to fight; to fetch; to make; to tie up; to issue; to shoot; to calculate; since; from[cedict]