ADV
第三(点)
You use thirdly when you want to make a third point or give a third reason for something.
例句
First of all, there are not many of them, and secondly, they have little money and, thirdly, they have few big businesses.
首先，他们人数不多;第二，他们钱很少;第三，他们没有几家大企业。