primary tissue的用法和樣例：
例句
- It is constantly replaced by newly formed cells as the older tissue is sloughed off with growth of the root through the soil.
隨著根尖的生長，根冠外層的薄壁細胞與土壤顆粒磨擦，不斷脫落，死亡，由其內的分生組織細胞不斷分裂，補充到根冠，使根冠保持一定的厚度。 - The vascular cambium extends to form a complete ring of meristematic tissue around the stem, the separate vascular bundles being linked by interfascicular cambium.
維管形成層向兩側延伸直至形成一個莖內的分生組織環，各個維管束被束間形成層聯繫在一起。
