They ended up moving to a small town and no longer engaged in subsistence agriculture, if his parents had, or his grandparents.

最后他们移居到一个小镇上,不再把持小农经营,不像他爸妈,或者祖父一辈

耶鲁公开课 - 美国内战与重建课程节选

People have to evolve to have biology that tolerates the subsistence that they access to, and that varies in different parts of the world, so again, humans evolve.

人类不得不演化,以适应周遭环境,世界各地环境各不相同,因此,人类再次演化

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选