Few people expend time and effort to monitor and assess the value of their promotional efforts.很少有人会花时间和精力去监督和评估他们在促销上下的功夫发挥了多少价值。

Children expend a lot of energy and may need more high-energy food than adults.孩子们消耗很多能量, 可能比成年人需要更多高能量的食物。