England were thumped by 111 runs in Melbourne on Saturday in a game where little went right for them from the moment they dropped Australia century-maker Aaron Finch off the fifth ball of the match.
Co-hosts Australia piled up 342 for nine before dismissing their arch-rivals for 231 to record an emphatic victory.
"Obviously we were disappointed after the result, but we are over it now," said England opener Ali, whose side now face another stiff Pool A challenge when they face New Zealand, the other host nation, in Wellington on Friday.
Ali said there was still plenty of time for England to recover and book their place in the quarter-finals.
Also Read
"We have so much to play for," he said. "It was just one game. The World Cup is not decided over one game. It is a long period of time. There's a long way to go."
All 14 teams will play six first-round matches, with the top four from each of the two pools qualifying for the quarter-finals.
"Australia have set the standard and New Zealand is going to be just as hard, we feel," he said. "We are going to have to up our skill level and up our game against New Zealand. It shows just how tough international cricket is, and in a major tournament we are going to have to be ready.