Bertoni, as far as I know, is a kind of hippie who lives by the sea collecting shells and seaweed.
据我所知，贝托尼是种居住在海边喜拾贝壳和海藻类型的嬉皮士。
2
The paper put forwards the way of extracting refining stevioside by boiling water from the leaves of stevia rebaudiana bertoni and removing impurities from extract by alcohol and ion exchanger.