thirdly

1. ADV You use thirdly when you want to make a third point or give a third reason for something. 第三 (点)

First of all, there are not many of them, and secondly, they have little money and, thirdly, they're hungry. 首先，他们人数不多；第二，他们没什么钱；第三，他们在挨饿。