"demonstrated once more" is a correct and usable phrase in written English.
You can use it to emphasize that something has been proven or shown again. For example, "The team's success demonstrates once more that hard work can lead to great achievements."
On Friday Georgina Pazcoguin demonstrated once more how she has the slinky style down.
Our country tends to privatize elder care, but there's a public responsibility as well, as Hurricane Sandy demonstrated once more.
It is difficult to imagine a team better at counterattacking than the Foxes, as demonstrated once more against Swansea on Saturday.
Yet Sarkozy demonstrated once more the range of his talents: brilliant and punchy rhetoric, the ability to master facts and figures and distort them to his advantage like the business lawyer he used to be, to go his opponent's jugular like the experienced, fearless politician he has been since his teens.
Recently the tsunami disaster, the London bombings and the landfall of hurricane Katrina demonstrated once more the need for an accurate, quick and easy to handle identification system.
This demonstrated once more that proper use of heating devices is a very important factor to be considered in solar designs.
It demonstrates once more that reform is needed of executive pay structures.
It demonstrates once more that the government is out of step in aggressively pushing this controversial trade deal".
Last summer, the Lakers struck again, acquiring Dwight Howard and Steve Nash, demonstrating once more Buss's commitment to winning at all costs.
The report demonstrates once more why we must return to the ban on imports of assault weapons that was enforced during the administrations of Presidents George H. W. Bush and Bill Clinton.
"Angela Whitiker's Climb" ("Class Matters" series, front page, June 12) demonstrates once more how much easier the upward climb is for people who were born into the middle class.
