in a factory 和at a factory区别

in a factory 释义：

在一家工厂

例句：

John was a manager in a factory.

约翰是一家工厂的经理。

at a factory释义：

在一个工厂

例句：

I've heard that at a factory in the area, two pregnant women who were working with paint requested a transfer to a safer department, because they wanted to prevent damage to their unborn babies.

我听说在该地区的一家工厂里，两名正在油漆车间工作的孕妇要求转到一个更安全的部门，因为她们想防止对她们未出生的婴儿造成伤害。