n.四位組；四分體；四元基
Abnormal development was observed at tetrad and mature embryo sac. 在四分體和成熟胚囊時期觀察到了異常發(fā)育現(xiàn)象。
The megaspore mother cell meiosis to form a linear megaspore tetrad. 大孢子母細胞減數(shù)分裂產(chǎn)生直線形大孢子四分體。
n.四德拉克馬銀幣(古希臘銀幣名)
