Daily Chinese Idiom Guessing Game
Difficult and complex problems that are hard to diagnose or solve.
难辨或难治的各种病症。比喻难以理解或解决的问题。
鲁迅《二心集·风马牛》然而那下面的一个名词，却不写尚可，一写倒成了疑难杂症。”
The company's financial troubles are a real 疑难杂症 that will take years to fix.