機器
agriculture
alviso
america
bay
blue
california
canal
channel
concrete
control
dam
energy
engineering
farm
fence
field
flood
floodgate
flow
flowing
francisco
gate
green
irrigate
irrigation
jose
level
line
lock
marsh
old
open
plant
pond
power
reflection
reservoir
river
san
sluice
soil
south
states
sunny
system
technology
tide
united
water