英语语法分析

The agreement was declared void ab initio.

此协议自一开始就被宣布无效。

《牛津词典》

The reaction of HNO with o radical was investigated by density functional theory (DFT) and ab initio methods.

用密度泛函理论(DFT)和从头算方法，对HNO与O自由基反应进行了研究。

Ab initio molecular orbital method has been employed, in this paper, to study the mechanism of the hydrolysis of acetylcholine.

本文对乙酰胆碱水解反应历程进行了从头算分子轨道研究。