粮食问题不仅是经济问题,更是政治问题,关系到国家的长治久安。
We must always question our assumptions and be willing to revise our understanding in light of new evidence.
凡事天下要考察有无的原则,必定是以众人的耳目所见所闻的实情以知有与无来作为标准的。
The future of drones is open and shared.