英文關鍵字
adventure
altitude
bridge
canyon
challenge
connection
cross
danger
day
difficulty
expedition
exploration
fear
forward
fright
hang
hanging
high
highland
hike
horizontal
investigation
link
mountain
moving
outdoors
overcoming
path
restriction
risk
river
road
scare
snow
stream
surmounting
track
travel
trekking
valley
walkway
way