Data abstraction is the reduction of a particular body of data to a simplified representation of the whole.

宇宙是一个广阔而神秘的地方，我们才刚刚开始理解它的复杂性。

The main task in life is simply this: to identify and separate from the things that are not ourselves, so that we can become ourselves.

The hour of departure has arrived，and we go our separate ways，I to die，and you to live。Which of these two is better only God knows.

The most exciting discoveries often come from looking at old problems in completely new ways.

死者是最执着的历史学家。