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。

The essence of modernity is psychologism, the experiencing and interpretation of the world in terms of the reactions of our inner life and indeed as an inner world, the dissolution of fixed contents in the fluid element of the soul, from which all that is substantive is filtered and whose forms are merely forms of motion.

石头或许坚硬，但我们的决心必须更加坚定。