The hardest thing is to live richly in the present without letting it be tainted by the past or future.

We must balance the need for energy security with the imperative of reducing emissions.

力量微薄却肩负重任，长久以来精神疲惫，若再勉强支撑，衰弱的身体必定无法承受。

The mind evolves to meet the challenges of existence.

自适应控制是根据观察到的系统行为调整控制器参数。