博士

In a sentence

• 他是一位化学博士。

  He is a chemistry Ph.D.

  Here, '博士' refers to a person who has achieved a doctoral degree in a specific field.

• 那家公司招聘了几名博士研究员。

  That company hired several postdoctoral researchers.

  In this sentence, '博士' is used to denote someone with a doctorate degree working in a research capacity.

• 我听说她是语言学博士，但她也对历史很有研究。

  I heard she is a linguistics doctorate, but she also has deep knowledge in history.

  Here, '博士' refers to an individual specializing in linguistics who has achieved the highest academic degree.