家中闲坐无聊,不妨想想,有人在为生活而辛劳;官位不能飞黄腾达,想想仍有许多才能好的读书人,人都老了还是青衣。
Every mathematical problem is a puzzle waiting to be solved, and every solution is a step towards greater understanding.
海鲜的真正成本不在价格标签上,而在于我们保护或破坏的生态平衡。