Quality is free. It's not a gift, but it's free. What costs money are the unquality things -- all the actions that involve not doing jobs right the first time.

宇宙是由数学定律支配的机器。

The context is the starting point of any project.

机器学习是让计算机在没有明确编程的情况下行动的科学。

热切而强烈的渴望，是一切有效努力的泉源。