I have to dump out the dust bunny every time I clean the bedroom.每次清理睡房时,我都会清出一团灰尘.The boys are curled asleep in the small bedroom upstairs.男孩们蜷缩在楼上的小卧室里睡熟了。I once heard her weeping in her bedroom, which cut me to the qu...
心皮是由大孢子叶两边愈合进化而来的.It has evolved by fusion of the two edges of the megasporophyll.孢子异型:指植物产生两种大小不同的孢子: 小孢子和大孢子.Heterospory The production of two different sizes of spore: microspores and megaspores.通常较大的大孢子含有更多的贮藏养料.The ...