英文關鍵字
agitated
autumn
back
backwater
balance
beaver
beavers
branch
branches
bridges
broken
budget
bulls
canal
causeway
centennial
cofferdam
dam
dammed
dike
engineering
forest
head
headrace
hydraulic
hydrologic
hydrological
hydrology
irrigation
late
levee
level
live
naturalization
nibbled
park
pond
race
rains
raised
reaches
river
side
stalled
stream
structure
structures
stubby
timber
tree
type
upgrade
upper
upstream
water
waterside
waterworks
weir
wildlife
wood
woodlandn
works