Any of a variety of substances, including certain vitamins, herbs, and prescription drugs, reputed to improve such mental functions as memory and alertness or to lessen or prevent damage to brain cells.智能药品：任何不同种类的物质，包含某种维生素、草药及处方药，据说可以改善记忆力等心智功能并降低甚至预防脑细胞受损