英文關鍵字
afloat
background
buoy
buoyant
concept
damage
danger
defense
dirty
diving
drowning
eliminated
emergency
environment
equipment
floating
garbage
guard
help
junk
lake
life
lifebuoy
move
moving
nature
old
people
person
pollution
protection
red
rescue
ripple
river
rope
round
safety
salvation
saver
sea
security
sos
survival
swimming
underwater
water
wave
wheel
white