string a = "a";string b = "b";string c = "c";string r = a == "a" ? b == "b" ? c=="c" ? "b" : "cc" : "33":"44";string rr = a == "a"? b == "b" ?(c == "c" ? "b" : "cc") : "33" : "44";string rrr = a == "a"? (b == "b" ?(c == "c" ? "b" : "cc") : "33") : "44";

》》》从内部三元运算符，一层一层往外剥离