validity

n.有效，正确

vainly, vainness, valance, vale, valediction, valedictorian, valedictory, valence, valency, valentine, Valentine's Day, valerian, valet, valetudinarian, valian, valiant, valiantly, valid, validate, validation, valise, Valium, valley, valorous, valour (US valor), valuable, valuables, valuation, value, value oneself on, valued, valueless, valve, van, vanguard, vanilla, vanish, vanished, vanity, vanquish,