实验室保存了许多昆虫标本用于研究。

The lab preserves many insect ___specimens for research.

医生要求采集血液样本进行进一步检测。

The doctor requested blood ___specimens for further testing.

他就是那种典型的书呆子，整天泡在图书馆里。

He's such a ___specimen of a nerd, always buried in the library.