短语讲解：

1. In addition to Mississippi, the three poorest states include West Virginia and Arkansas.

in addition to 除…之外
例句：Satum has ten moons in addition to its amazing rings.
除了它那使人惊奇的光环外，土星还有十个卫星。

2. It’s the fourth year in a row that poverty rates were not  different from the previous year.

be different from 不同于; 与…不同
例句：May your destiny be different from her.
希望你的命运和她不同。
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