门外汉

ménwàihàn

门外汉 — ménwàihàn

layman; non‑expert
他只是个门外汉，不要问他专业问题。 tā zhǐshì gè ménwàihàn búyào wèn tā zhuānyè wèntí — He's just a layman; don't ask him specialist questions.