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。

到处都有痛苦。

I think we have gone through a period when too many children and people have been given to understand 'I have a problem, it is the Government's job to cope with it!' or 'I have a problem, I will go and get a grant to cope with it!' 'I am homeless, the Government must house me!' and so they are casting their problems on society and who is society? There is no such thing! There are individual men and women and there are families and no government can do anything except through people and people look to themselves first.

饥饿天使是一个隐喻，饥饿如影随形地跟踪着你。