Sustainability must be at the core of every decision we make in the oil and gas industry.

Doublethink means the power of holding two contradictory beliefs in one's mind simultaneously, and accepting both of them.

I'm not perfect, but I'm always myself.

The only way to learn mathematics is to do mathematics.

教师必须具有健康的体魄，农人的身手，科学的头脑，艺术的兴味，改革社会的精神。