英语语法分析

The steric structure is the main effect on the herbicidal activity as results.

研究结果表明，影响其药效的主要因素是空间结构。

Some spectacular herbicidal compounds from the microbial products in recent years are presented.

介绍了近期国内外引人注目的微生物源除草化合物。

These compounds with novel structure are good at the herbicidal activity and novel in the action mechanism.

这些化合物具有新颖的化学结构、新奇的作用机理以及良好的除草活性。