expire;become due;mature（指存款等）;maturity;when bonds are due 条约下月～。The treaty expires next month./存款月底～。The deposit matures at the end of the month./这本书已经～。The book is due for return./这张票据何时～？When does this bill mature (or become due)/～付款payable at maturity/～付款额balance due /～利息 interest due/～收益yield to maturity/～政府债务matured government debts