Black holes are not just cosmic vacuums; they are the ultimate laboratories for testing the limits of our physical theories.
农业的未来取决于我们整合传统与创新的能力。
正如几何学最自然的起点是数学点,在观察和自然历史中采用同样的方法也最真实、简单且富有教益。
The progress of society depends on the efforts of each individual.
"Every border is a fiction, drawn first in the mind before it scars the earth."