| 释义 |
DEFINITIVE EXAMPLES 权威例句〔eustele〕The central cylinder in which the primary vascular tissue is arranged around a pith, as in most seed plants.真中柱:一种管状中柱,其中初生脉管组织排列在髓孔周围,存在于大多数种子植物中美国传统〔pith〕Botany The soft, spongelike, central cylinder of the stems of most flowering plants, composed mainly of parenchyma.【植物学】 (木)髓:许多生花植物树干中心部位中的软似海绵的物质,主要由薄壁组织构成美国传统 |