[kuai4 su4] /fast/high-speed/rapid/
  [kuai4 su4] /Eilbrief (u.E.) (S)/Geschwindigkeit (u.E.) (S)/Schnelligkeit (u.E.) (S)/eilen (u.E.) (V)/eilig (u.E.) (V)/fixen (u.E.) (V)/rasch (u.E.) (Adj)/
  [kuai4 su4] /rapide/à grande vitesse/
 [かいそく] /(adj-na,n,adj-no) high speed/celerity/mobility/express (train that bypasses many stations)/(P)/EntL1200080X/
Visszatérés a(z) „快速” laphoz.