Regular cervical smears can prevent cervical cancer. 定期进行子宫颈细胞检验可帮助预防子宫颈癌。
The pollination drop was withdrawn into the micropyle which was later sealed by enlargement of the cells lining the micropylar canal. 花粉管在五月底穿透珠心,此时花粉管的生长缓慢,到六月上旬,花粉管快速的伸长到藏卵器颈细胞的表面。