in a good and careful way, with no waste of time, money or energy 以一种良好和谨慎的方式,不浪费时间、金钱或精力 a very efficiently organized event 组织效率极高的活动 Resources must be used efficiently to avoid waste. 必须有效利用资源以避免浪费。 If markets fail or do not work efficiently, government has a role to play. 如果市场失灵或不能有效运行,政府可以发挥作用。