拓扑学是对图形在任何变形下保持不变的性质的研究。
Make it simple. Make it memorable. Make it inviting to look at. Make it fun to read.
To write is to explore the unknown within ourselves.
每个空间都有自己的声音;我们的任务是倾听。
The existence of a legal system is a matter of fact, not of morality.
Every sentence I utter must be understood not as an affirmation, but as a question.
绿色低碳转型是石油行业的必然选择,我们要在保障能源供应的同时,积极推进清洁能源发展。