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忽然间

suddenly, all of a sudden

adverb Rare #25,484
suddenly, all of a sudden Often adds a sense of a sudden change or moment; sometimes the 间 is omitted and 忽然 is used alone.
CH: 忽然间，外面下起雨来。
EN: All of a sudden, it started raining outside.

忽然间对这个世界陌生起来

All of a sudden, this world felt unfamiliar to me.

— 摩托日记 (2004)

忽然间，世界.

Suddenly, the world.

— 红磨坊 (2001)

忽然间，我们俩都明白了。

Suddenly, we both understood.