英文關鍵字
closeup
large
smooth
stone
water
verzaska
mountain
river
underwater
nature
untouched
wilderness
transparent
under
rock
seaweed
green
pure
waters
flowing
fast
view
switzerland
create
incredible
patterns
sharp
tool
rough
whetstone
carbide
cut
grindstone
domestic
preparation
grind
beach
snakestone
clear
dull
grey
abrasive
objects
ecotourism
environmentally
friendly
ecologically
safe