Geography is the science of place. Its vision is grand, its view panoramic.
地理学是研究地方的科学。它的视野宏大，视角全景。
学习任何事情的最好方法就是去做。
The quest for certainty blocks the search for meaning. Uncertainty is the very condition to impel man to unfold his powers.
If a man is proud of his wealth，he should not be praised until it is known how he employs it.
In the past the man has been first; in the future the system must be first.
无人机的未来在于垂直领域的深耕。
《要图工人经济生活的安全幸福》，1919年6月