英文關鍵字
beach
coastline
danger
day
flag
hazard
highangle
lifeguard
medium
nature
object
resort
safeguard
safety
sea
shore
sign
summer
surf
symbol
transportation
travel
tropical
vacation
warning
waves
yellow
英文關鍵字
beach
coastline
danger
day
flag
hazard
highangle
lifeguard
medium
nature
object
resort
safeguard
safety
sea
shore
sign
summer
surf
symbol
transportation
travel
tropical
vacation
warning
waves
yellow