发现宇宙加速膨胀完全是一个意外。
The discovery of the accelerating expansion of the universe was a complete surprise.
我们不仅要追求利润，更要追求对社会的贡献。
Probability theory is nothing but common sense reduced to calculation.
You never know with these things when you're trying something new what can happen. This is all experimental.
可归约性的概念对于理解不同计算问题之间的关系至关重要。