英语语法分析

Flour is sold by the kilogram.

面粉按公斤出售。

《牛津词典》

We bought a kilogram of lemons from the supermarket.

我们从超市买了一公斤的柠檬。

We will take a chunk of some material and we will call it a kilogram.

我们取一大块物质，称它为一千克。