这个国家的教育体系建立在马克思主义列宁主义理论基础上。

The country's education system is built on ___Marxist-Leninist theory.

他是一位坚定的马克思列宁主义者，经常组织学习小组讨论革命理论。

He is a committed ___Marxist-Leninist who often organizes study groups to discuss revolutionary theories.