药物治疗的目标,在于适时、适量地将确需的物质准确无误地输送至人体的特定部位。按理,药物研究人员应对人体化学有足够的知识(不论是正常的还是不正常的),才可创造出能为任何疾病提供符合上述准则的化学体系。药物研究工作的实际情况却相距甚远。研究人员为了寻求有效的药物,须从几千种化合物中进行筛选以考查每一种化合物在人体中所起的作用,希望终于能找到合乎要求的那一种。 The goal of medical treatment is to deliver the rightly needed substances to specific parts of the human body in a timely and appropriate manner. It is reasonable to expect that drug researchers should have sufficient knowledge of human chemistry, either normal or abnormal, to create a chemical system that meets the above criteria for any disease. The actual situation of drug research is far apart. Researchers searching for thousands of compounds to find effective drugs have to examine the role of each compound in the human body, hoping to finally find the desired one.