英语语法分析

OBJECTIVE: To study conditions and methods of extractive Leonurine by ultrasound.

目的：探讨用超声波提取法提取益母草总碱的条件。

Leonurine, about 0.05%; small amount during the early stages of blooming, then gradually increases.

益母草全草含益母草碱，约0.05%(花初期含微量，花期中逐渐增高)。