食洋不化 | shí yáng bù huà
Xi Jinping used this chengyu in a speech about the Marxist political economy at the 28th Politburo study session on November 23, 2015.
Meaning
(Variant of 食古不化) Swallowing foreign ideas without digesting them; quoting foreign ideas in full without analyzing and comparing
Original
“在我们的经济学教学中，不能食洋不化，还是要讲马克思主义政治经济学，当代中国社会主义政治经济学要大讲特讲，不能被边缘化。”