3 sentences

1. 我其实是海洋生物学家。

   wǒ qí​shí shì hǎi​yáng shēng​wù​xué​jiā.

   I'm a marine biologist, actually.

   Source: OpenSubtitles

2. 这位生物学家致力于研究海洋生态系统。

   zhè wèi shēng​wù​xué​jiā zhì​lì yú yán​jiū hǎi​yáng shēng​tài xì​tǒng.

   This biologist is dedicated to studying marine ecosystems.

   Source: Dong Chinese Dictionary

3. 我最近正在读一本关于生物学家达尔文的传记。

   wǒ zuì​jìn zhèng​zài dú yī běn guān​yú shēng​wù​xué​jiā Dá'ěr​wén de zhuàn​jì.

   Recently, I have been reading a biography of the biologist Darwin.

   Source: Dong Chinese Dictionary