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]
前线
qián xiànㄑㄧㄢˊ ㄒㄧㄢˋ
front line; military front; workface; cutting edge[cedict]
打击
dǎ jīㄉㄚˇ ㄐㄧ
to hit; to strike; to attack; to crackdown on sth; a setback; a blow[cedict]