英文關鍵字
2017
architecture
berlin
blue
board
boat
bridge
building
canal
channel
control
dam
design
edge
electric
energy
engineering
flood
floodgate
flow
gate
german
germany
gota
hydropower
industrial
industry
level
lock
may
nature
power
prevention
purification
river
sky
spree
station
summer
sunset
technology
transportation
travel
trip
wall
water
white