达尔文主义解释了为什么长颈鹿进化出了长脖子来获取高处的树叶。

___Darwinism explains why giraffes evolved long necks to reach leaves high up.

用达尔文主义解释文化变迁的尝试引发了激烈的学术争论。

Attempts to apply ___Darwinism to cultural changes have sparked intense academic debates.