(接昨天+)。第三段照录如次(12:10许)。In dimension one, there is only one Fano variety which is P1. In dimension two, there are many, in fact, infinitely many families. To get a better picture one needs to impose a bound on the singularities. For example, it is a classical result that the smooth Fano surfaces form a bounded family. More generally, the Fano surfaces with eps-log canonical (eps-lc) singularities form a bounded family [1], for any fixed eps > 0 (see 2.2 for definition of singularities). The smaller is eps the larger is the family.