root tip的用法和样例：
例句
- The conclusion of this study was that potassium dichromate has obvious teratogenic effect on Vicia faba root tip cells.
结论是重铬酸钾对蚕豆根尖细胞具有明显的致畸效应。 - The space environment had stimulating mitosis action on root tip cells.Other mutagens had inhibiting mitosis action.
空间环境促进根尖细胞有丝分裂活动，其它诱变因素均不同程度地抑制根尖细胞有丝分裂活动。
