低空飞过

to just scrape through with a narrow pass (in an exam)

low / beneath / to lower (one's head) / to let droop / to hang down / to incline

low altitude

empty / air / sky / in vain

to empty / vacant / unoccupied / space / leisure / free time

to fly

to fly over / to fly past

surname Guo

to cross / to go over / to pass (time) / to celebrate (a holiday) / to live / to get along / excessively / too-

(experienced action marker)