Data abstraction is the reduction of a particular body of data to a simplified representation of the whole.
无人机不是玩具,而是改变行业的工具。
最好的报复是巨大的成功。
让睁眼看着玫瑰花的人也看看它的刺。
In science, the credit goes to the man who convinces the world, not to the man to whom the idea first occurs.