volitional

adj: a volitional act 自愿的行动.

vociferate, vociferous, vociferously, vodka, vogue, vogue-word, voice, voice-box, voice-over, voiceless, void, voile, vol, vol-au-vent, volatile, volatility, volcanic, volcano, vole, volition, volley, volley-ball, volleyball, volt, voltage, volte-face, volubility, voluble, volubly, volume, voluminous, voluntarily, voluntary, volunteer, voluptuous, Volvo, vomit, voracious, voracity, votary,