疑难

疑难 [yí nàn]

1. ■ difficult; knotty; puzzle:

疑难问题 a knotty problem;

疑难病症 difficult and complicated cases (of illness); hard-treat case

---

常用词组

1. ■ 疑难工程 problem job;

2. ■ 疑难解答专家 solutionist;

3. ■ 疑难榴石 griphite;

4. ■ 疑难学名 nomen dubium