例5　To those who are unaware that animal research was needed to produce these treatments, as well as new treatments and vaccines, animal research seems wasteful at best and cruel at worst.

【结构分析】开头是个介词短语to those，后面是定语从句，定语从句的主语是who，动词是are unaware，后面是宾语从句that animal research was needed to produce these treatments, as well as new treatments and vaccines，句子真正的主干是animal research seems wasteful at best and cruel at worst。

【亮点回放】此句话的亮点在于对于那些不了解动物实验的人进行解释，这个句型是To those who are unaware that..., sth seems...比如To those who are unaware that English learning is so important, teachers seem to play a crucial role in explaining it。

【核心词汇】

unaware　不知道

animal research　动物研究

produce these treatments　进行这些治疗

vaccines　疫苗

wasteful at best and cruel at worst　说得最好听是浪费，说得最难听是残忍

【参考译文】对于那些不知道做这些医疗、研究新的治疗方法和疫苗就需要进行动物研究的人来说，动物研究说的最好听是浪费，说得最难听是残忍。