求翻译：因此需要制备能使药物特异性的到达靶位的靶向给药系统，既能提高药效，也可以降低毒副作用。纳米载药系统不仅 具有良好的靶向性，同时还可以克服体内存在的各种药物屏障、治疗指数低等缺点，还可以延长有些药物的半衰期。是什么意思？

Make reach the target of the drug-specific targeted drug delivery systems need to be prepared, both increase efficacy and reduced toxicity. Nano-drug delivery system not only has good targeting, but also can overcome the barrier of the body a variety of drugs, therapeutic index and low defects, but

We therefore need to be prepared to make the specificity of the drug to reach the target to the target system, which will both improve the energy efficiency, and can also reduce toxic side effects. NM contained not only the system with a good target, and at the same time can also be overcome all the

Therefore needs to prepare can enable the medicine specificity to arrive the target position the target to give the medicine system, also can enhance the drug efficacy, also may reduce the poisonous side effect.Not only the nanometer carries the medicine system to have the good target tropism, meanw

Preparation of drug-specific needs of targeted drug delivery systems to reach the target, can not only improve the efficacy, can also reduce the side effects. Nano-drug systems not only have good targeting, while overcoming existing barriers, various drugs in vivo disadvantages low therapeutic index

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