"以货柜为单位"如何翻译呢?

on the basis of container

to use container as calculated unit

你是不是问货柜车的运载单位，商务上是用FTL，即Full Truck Load。

英文翻译，需要稍微转一转原文才比较顺畅：
using truck load units as the basis for calculation.
以货柜车载量单位为计算。

For a container

counted by TEU as unit

TEU---twentyfoot equivalent unit标准箱

on container unit