It is necessary from the very nature of things that power should be a check to power.

生活中唯一的限制是你自己设定的。

You don't have to be pretty like her. You can be pretty like you.

过去总是紧张的，未来是完美的。

The beauty of physics lies in its ability to explain the complex with the simple.

"The comeback is always stronger than the setback."