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 ...
那座城市的街道肮脏不堪，弥漫着令人窒息的废气。The city's streets are filthy and choked with exhaust fumes.他们冲下楼梯，来到狭窄、肮脏的街上。They chased down the stairs into the narrow, dirty street.他发现自己的哥哥住在一套破旧肮脏、蟑螂肆虐的公寓里。He found his brother in a seed...
Fluorescent lights flickered, and then the room was brilliantly, blindingly bright.荧光灯闪了几下，接着屋子里豁然大亮，刺得人睁不开眼。The reason is blindingly obvious .原因十分明显。Things appear blindingly bright and tears come out of my eyes.东西看上去令人目...
Uncle Sebastian used to tease Mother and Daddy unmercifully that all they could produce was girls.塞巴斯蒂安叔叔过去常无情地嘲讽爸爸和妈妈，说他们只会生女儿。Look at the numbers of small businesses that are being hammered unmercifully.看看有多少小企业正在遭受无情的...