Child: Why are avocados sold by piece, not weight? 孩子：牛油果为什么按个卖而不是称重？ → 注释：by piece/weight 计量方式 Mom: Compare unit prices on the shelf tags. 妈妈：对比货架标签上的单价。 Child: Can we get free-range eggs? (散养鸡蛋) Dad ...