Many countries around the world have their own progressive income tax systems.

世界上许多国家都有自己的累进所得税制度。

This is the progressive income tax system all U.S. taxpayers live under, and I don't see we should be any different.

这是所有美国纳税人都遵从的累进个人所得税制，我认为我们应该有任何不同。