实现明天理想的唯一障碍是今天的疑虑。
The only limit to our realization of tomorrow is our doubts of today.
你管理事物;你领导人们。
"Always be learning. The world is constantly changing, and you need to keep up."
The key is to keep improving, keep fighting, keep believing.
解释:屋顶是否有漏洞,下面的人才知道。