某些植物的珠被和珠心细胞形成完全正常的胚.The cells of the integument and nucellus of some plants form perfectly normal embryos.大多数被子植物的胚珠有两层珠被, 而裸子植物通常只有一层.Most angiosperm ovules possess two integuments, while gymnosperms usually have only ...
Dena lit a cigarette, trying to mask her agitation.德娜点燃了一根烟，试图掩饰不安。He had no wish to uproot Dena from her present home.他没想过让德娜离开现在的家去别处居住。He went and poured a brandy for Dena and brought it to her.他走过去为德娜倒了一杯白兰地，端到她跟前。De...