A visit to the museum is an unforgettable experience.

对该博物馆的参观是一次难忘的经历。

《柯林斯英汉双解大词典》

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People usually regard it as an unforgettable lesson.

人们通常认为这是一个难忘的教训。

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Its reddish color and changes in brightness over time make the planet an unforgettable sight.

VOA: special.2010.07.28

She appeared on just three shows but was an unforgettable Catwoman.

VOA: special.2009.06.07

Those who have managed to get hold of tickets have no doubts it will be an unforgettable match, like this Spanish fan who has high hopes his team will win.

VOA: standard.2009.05.26

Its Ferris Wheel, which was never put into action, is now an unforgettable symbol of the catastrophe.

BBC: A day trip to Chernobyl

The miss was to prove costly as Robson snatched the three points with an unforgettable strike.

BBC: Sport - Middlesbrough 1-0 Hull

Sign an accord that translates to an unforgettable weekend... designated license plates not included.

BBC: Daily deal: Two nights in Washington, DC