She is the happiest of the world.
She is the happiest in the world.
两句话分别用了不同介词of, in，句子整确吗？两句话意思完全相同？还是各有侧重？
盼专家老师指导。
后加地点，场所等用介词in，She is the happiest in the world.
如和主语属于同类别时用介词of，She is the happiest of the girls.
She is the happiest of the world.（错误）
She is the happiest in the world. （正确）
