meristematic tissue的用法和样例：
例句
- It may develop by thickening of the secondary walls of parenchyma cells, or it may arise directly from meristematic cells.
它们可能由薄壁组织的细胞壁次生加厚而成，也可能直接来自于分生组织细胞。 - It is constantly replaced by newly formed cells as the older tissue is sloughed off with growth of the root through the soil.
随着根尖的生长，根冠外层的薄壁细胞与土壤颗粒磨擦，不断脱落，死亡，由其内的分生组织细胞不断分裂，补充到根冠，使根冠保持一定的厚度。
