做东西的时候，总要多备上一些——额外的材料、额外的部件、额外的空间、额外的饰面。这些额外的东西可以为错误提供备份、减轻压力，还可以为未来储备资源。它们是最便宜的保险。
The reality is: sometimes you lose. And you're never too good to lose. You're never too big to lose. You're never too smart to lose. It happens.
