常见例句双语例句Aim To study asymmetric total synthesis of 14 nor huperzine A 2 and its inhibitory activity on acetylcholinesterase.目的（- ） 1 4 去甲基石杉碱甲的合成及其抑制乙酰胆碱酯酶活性研究。 返回 asymmetric total synthesis