"Good night, my dear" is a common and popte way to say "good night" to someone you care about in Engpsh.

In Engpsh, there are many different ways to greet someone or to say goodbye, depending on the context, the relationship between the speakers, and the level of formapty. "Good night" is a simple and common way to say goodbye at the end of the day or before going to bed.

By adding "my dear," the expression becomes more affectionate and personal. "My dear" is a term of endearment that shows affection, love, or close friendship.

Here are some examples with their translations:

"Good night, my dear. Sleep well."
"Good night, my love. Sweet dreams."
"Goodnight, my dearest. See you tomorrow."

来源：英语是一种语言，源自从古代以至今世界各地的许多语言。“Good night”是一个简单的表达，用于在一天结束或在睡觉前告别他人。加上“my dear”，这种表达就变得更具亲切和个人感觉。“My dear”是一种显示亲爱、爱或亲密友谊的亲昵称呼。