英文關鍵字
adversity
alertness
asphalt
block
blockage
blocked
broken
caution
caves
cliff
damage
danger
day
debris
destruction
earthquake
emergency
environment
fall
hazard
hill
hillside
hindrance
information
land
landfall
landscape
landslide
mountain
nature
northern
obstruction
outdoors
path
repair
road
rock
rockfall
route
safety
sign
slope
stone
summer
symbol
transportation
travel
triangle
trip
warning