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.
复杂性理论告诉我们,并非所有问题都是平等的;有些问题本质上比其他问题更难。
地租是由土地的肥沃度和位置所决定的。
The beauty of biology lies in its ability to explain the diversity of life through simple principles.