乳制品生产的可持续性不是一种选择，而是对后代子孙的必要责任。

The advancement of robot technology is to make human life better.

When speaking to an audience it’s better to fix your gaze on a few people than to “spray” your gaze across the room. Your eyes telegraph to others whether you really believe what you are saying.

"The world breaks everyone, and afterward, many are strong at the broken places."

The real tragedy of the poor is that they can do nothing but wait for the rich to give them something.

法律义务的概念对于理解法律至关重要。

解释：别人爱我，我也一定会爱别人；别人厌恶我，我也一定会讨厌别人。

电流概念的形成是电学理论发展中最重要的步骤。