A -- timekeeper B -- land drill
C -- touching, the finishing line D -- lifeguard
E -- artificial waves F -- back stroke
G -- swimming lane H -- treading water
I -- diving pool J -- breast stroke
K -- one-meter springboard L -- butterfly stroke
M -- starting dive N -- changing room
O -- starting block P -- side stroke
Q -- swimming suit ( ) 蝶泳 ( ) 计时员