单词	a stubborn problem
释义	a stubborn problem 难题
随便看	traditional ancient town traditional and advanced Traditional and medical traditional and modem traditional and modern traditional and non-traditional security traditional and non-traditional security issues traditional and western medicine traditional and western medicine therapy traditional animation traditional annealing traditional anthropocentrism traditional anti-corruption traditional anti-earthquake traditional antiepileptic drugs traditional anti-glaucoma Traditional antipsychotics traditional apparel Traditional application traditional apprenticeship traditional approach traditional approach to kashmir traditional approximation traditional arch bridge architecture traditional architectural craft