Development of new drug的用法和样例：
例句
- The study on anticancer effects and mechanisms of compositions from Chinese materia medica in vivo is very necessary for new drug development.
通过动物实验研究中药抗肿瘤作用及机制是新药开发的必要途径。 - Because of small content in the plant, complicated extracting procedure and poor purity, the process of new drug R&D based on Danshensu has been hampered acutely.
然而，丹参素在植物中的含量甚少，提取工艺复杂且纯度不高，这严重阻碍了以其为基础的新药开发进程。
