错节盘根

Explanation: Wrong: staggered; section: minor; disk: twisting. Roots and branches of trees circled cross. ① metaphor to numerous difficult 　　Source: "Han Yu Xu Chuan": "go rather easy to find, never shy, but also the post of minister; do not encounter deep-rooted, why do almost weapon?" 　　Examples: Loyalty to light, naturally clean, ~, test rules maneuver. ★ Song Auspicious "Zhao pass sentence"