系统的稳定性取决于开环传递函数在复平面上的行为。
The night doesn't always bring answers, but it always brings the right questions.
In this industry, tradition and technology must walk hand in hand.
The less virtue， the more wealth there is； the less wealth， the more virtue.
最大的风险是不冒任何风险。在一个快速变化的世界里，唯一注定失败的策略就是不冒险。