For this reason, we observe daily tide levels that fluctuate between extreme high and low every six hours.
(we; observe; daily tide levels that fluctuate between extreme high and low every six hours) (daily tide levels; fluctuate; T:between extreme high and low every six hours)
we daily tide levels
observe fluctuate
daily tide levels that fluctuate between extreme high and low every six hours
T:between extreme high and low every six hours