一些怀疑论者质疑进化论的科学依据。

Some ___skeptics challenge the scientific basis of the theory of evolution.

科学界的怀疑者们要求更多的实验数据来验证这一发现。

The ___skeptics in the scientific community called for more experimental data to verify the discovery.

古希腊的怀疑论者质疑人类能否获得真正的知识。

Ancient Greek ___skeptics questioned whether humans could attain true knowledge.