计算复杂性的美在于它能够根据问题的固有难度对问题进行分类。

Art washes away from the soul the dust of everyday life.

The energy sector is the backbone of any economy, and its stability ensures national security.

You are someone I will never forget.

人类无法长期生活在空虚状态中：如果他不是朝着某个方向成长，他不仅会停滞不前，被压抑的潜能会变成病态和绝望，最终转化为破坏性行为。