快 快 kuài Strokes7 Radical 忄 — heart Made of 忄 heart 夬 decisive, certain How it's builtIdeograph — the meaning is built from its parts Play the animation
速 速 sù Strokes10 Radical 辶 — to walk Made of 辶 to walk 束 to bind, to control, to restrain How it's builtPhono-semantic — one part hints at the meaning, another at the sound Play the animation More about the character 速