生活中唯一的限制是你为自己设定的限制。

To tax the larger incomes at a higher percentage than the smaller， is to lay a tax on industry and economy； to impose a penalty on people for having worked harder and saved more than their neighbors.

美国是世界上最强大的国家，在可预见的未来仍将如此。

教师的任务是引导学生从已知走向未知。