自动控制的根本问题是在存在干扰的情况下维持期望状态。
老虎起跳之前,必须先趴下蓄力然后才跳起来。
The more honest I am, the more my art resonates.
With a library you are free, not confined by temporary political climates. It is the most democratic of institutions because no one - but no one at all - can tell you what to read and when and how.