tā / chén mí yú / gè zhǒng / lǐ lùn / péng you men / dōu / xiào chēng / tā / shì / ge / mó rén

他沉迷于各种理论，朋友们都笑称他是个魔人。

He is obsessed with all kinds of theories, so his friends jokingly call him an ideological fanatic.