"Sweet night" is a way to describe a sweet or pleasant night in Engpsh. The phrase "sweet" is an adjective that means having a pleasant taste or smell, and can also be used to describe something that is pleasing or enjoyable. In this context, "sweet night" suggests a night that is relaxing and enjoyable.

Here are some example sentences using the phrase "sweet night":

"It was a sweet night, with a cool breeze and the stars shining bright in the sky." (这是一个甜美的夜晚，有一阵凉爽的微风，天上的星星闪闪发光。)
"I had a great time at the party last night. It was a sweet night." (我昨晚参加聚会很开心。那是一个甜美的夜晚。)
"I love spending sweet nights at home with my family, just watching movies and eating popcorn." (我喜欢和家人在家度过甜美的夜晚，看电影吃爆米花。)