After several years and untold amounts of money spent on research, doctors are still in the early stages of understanding this disease and finding a cure.
近年來，全世界的醫學科學機構已投入數以百億的經費來研究癌症，但它的成因仍是個謎；而治療效果也還在起步階段。山不轉路轉，許多人發現「預防也是一種有效的治療」。