According to the context, an idiom is summed up (near Zhu Zhechi, near Mexico is black).

(1) "We must keep a frank attitude towards problems ("Knowing is knowing, not knowing is not knowing "). If we don't understand, we must never pretend to understand, but we must change from ignorance to understanding. " (Zhou Enlai)

(2) "Communication ability is the most needed, but we must make friends correctly to avoid people entering the' fast lane' of interpersonal communication prematurely and being influenced by social bad guys".