For systems, the analogue of a face-lift is to add to the control graph an edge that creates a cycle, not just an additional node.

As you grow older, you will discover that you have two hands, one for helping yourself, the other for helping others.

可持续性不是一种选择；它是能源行业的必需品。

It is time to effect a revolution in female manners - time to restore to them their lost dignity.

真正的自由在于心灵和思想。