METHODS: The compounds were separated by solvent extraction, column chromatography and thin layer chromatography on silica gel and their structures were elucidated by spectroscopic means.是什么意思_METHODS: The compounds were separated by solvent extraction, column chromatography and thin layer chromatography on silica gel and their structures were elucidated by spectroscopic means.在線翻譯_英語_讀音_用法_例句