The diet is measured in ___calories,while the food is sold by___pound.

Question

为什么第一个不填 第二个填the 不都是单位么?
measured in the calorie

sold by pounds能不能这样说

Answer 1

is measured in calories 用卡路里来算，in表“用/以”的时候中间不加成分，而且calories复数形式，前面不加冠词。

Answer 2

可以。跟单复数有关。