on; on top; upon; first (of two parts); previous or last (week etc); upper; higher; above; previous; to climb; to go into; above; to go up; to attend (class or university); third tone of putonghua[cedict]
我
wǒㄨㄛˇ
I; me; my[cedict]
使用
shǐ yòngㄕˇ ㄩㄥˋ
to use; to employ; to apply; to make use of[cedict]