1. The baker provided a long dozen to ensure every customer was satisfied.
面包师提供了13个面包以确保每位顾客都满意。

2. We received a long dozen of eggs in the delivery.
我们在送达的货物中收到了13个鸡蛋。

A: Did you order twelve or thirteen apples?
A：你是订了12个还是13个苹果？

B: He gave us a long dozen as a special discount.
B：作为特别折扣，他多给了我们一个，一共是13个。

1) 数量为13个的一组物品

2) 在贸易中指比标准12个多一个的计法

1. 数量为13个的一组

e.g.
The merchant sold the rolls by the long dozen.
商人按13个一组销售这些小面包卷。

noun phrase

1. A quantity of thirteen items, rather than the standard dozen of twelve.