A good mathematician is one who can see analogies between theorems; a great mathematician is one who can see analogies between analogies.
These are the times that try men's souls.
可持续性是水产养殖的未来，我们必须投资于环保技术。
The greatest stories are those that reveal the human condition.
The end of history will be a very sad time. The struggle for recognition, the willingness to risk one's life for a purely abstract goal, the worldwide ideological struggle that called forth daring, courage, imagination, and idealism, will be replaced by economic calculation, the endless solving of technical problems, environmental concerns, and the satisfaction of sophisticated consumer demands.
Safety must always come before production targets.