控制理论是基于过去的信息来影响未来。
I'm not a person who is comfortable with confrontation, but I will stand up for myself if I have to.
实现明天的唯一限制是我们今天的疑虑。
Modern quarrying requires us to be geologists, ecologists, and community diplomats simultaneously.
Success is not final, failure is not fatal: It is the courage to continue that counts.