习惯用语of pith and moment1.重要的, 意义重大的the pith and marrow of sth.1.某事物的精华特殊用法bagasse pith1.蔗髓chambered pith1.分隔髓部hollow pith1.髓腔horn pith1.角髓lamellated pith1.层状髓心mixed pith1.混合髓