刘

In a sentence

• 我刚刚见到了刘先生，他是我的老朋友。

  I just saw Mr. Liu; he is an old friend of mine.

  Here, '刘' is a surname, which is commonly used in Mandarin names to address or refer to individuals with politeness.

• 刘校长将在学生大会上讲话。

  Principal Liu will speak at the student assembly.

  In this sentence, '刘' functions as a surname, paired with a title, '校长' (principal), providing specific identification.

• 这家餐馆用了一种特殊的技术来制作刘白菜。

  This restaurant uses a special technique to prepare Liu-style cabbage.

  '刘' here is used in a descriptive manner to indicate a style or recipe associated with the name Liu.