1. It was an unforgettable experience.
    那是一次令人难忘的经历。

1. 令人难忘：20 A 逻辑推理常识运用词义比较 我们也就可以用经过某一个熟悉却又无法叫出名字的(unnamed)人,这人也许令人难忘(unforgettable),也许难以置信(unbelievable),也许是不真实的(unreal),来识别我们自己所处的位置.

1. 难忘的
    If you describe something as unforgettable, you mean that it is, for example, extremely beautiful, enjoyable, or unusual, so that you remember it for a long time. You can also refer to extremely unpleasant things as unforgettable .

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    e.g. A visit to the Museum is an unforgettable experience...
           参观博物馆是一段令人难忘的经历。
    e.g. A bright shooting star, or meteor, is an unforgettable sight.
           明亮的流星，或者说陨石，是番难忘的景象。

1. impossible to forget