[ru4 men2] /entrance door/to enter a door/introduction (to a subject)/
  [ru4 men2] /Einleitung (u.E.) (S)/Rudiment (u.E.) (S)/Türschwelle (u.E.) (S)/erste Grundlagen erlernen (u.E.)/
  [ru4 men2] /initiation/s'initier/
 [にゅうもん] /(n,vs,adj-no) primer/manual/entering an institute/introduction to/(P)/EntL1466790X/
Visszatérés a(z) „入門” laphoz.