secular magnetic variation

例句：

1. 1. The secularization of society has led to a decline in traditional values.
   社会的世俗化导致了传统价值观的衰退。
2. 2. He is a secular scholar who studies the history of science.
   他是个研究科学史的世俗学者。
3. 3. The secularization of education has made it easier for people to access knowledge.
   教育的世俗化使得人们更容易获取知识。