由等式\(x^{4}+a_{1}x^{3}+a_{2}x^{2}+a_{3}x+a_{4}=(x+1)^{4}+b_{1}(x+1)^{3}+b_{2}(x+1)^{2}+b_{3}(x+1)+b_{4}\)，定义映射\(f\)：\((a_{1},a_{2},a_{3},a_{4})→(b_{1},b_{2},b_{3},b_{4})\)，则\(f(4,3,2,1)\)等于\((\)　　\()\)