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 ...
Mr Patrick seems to relish his insurgency , though , and most expect him to keep bashing away.现在帕特里克已经权力到手, 他是否会将其工作方法变得温和一些?Dr Zyphur is part an insurgency against this idea.塞弗博士是这一观点逆流的一部分.He has led a violent armed in...
Polyether - type isocyanate prepolymers are prepared with polyether polyols and tolylene diisocyanate.采用聚醚多元醇和甲苯二异氰酸酯合成了聚醚型异氰酸酯预聚体.A polyamide imide was synthesized from trimellitic anhydride and di isocyanate.本文用偏苯三酸酐和二...
The armed forces were on high alert to guard against any retaliation.武装部队保持高度戒备，以防发生任何报复行动。The bank is alert to the danger.银行充分意识到了危险。All the Plymouth hospitals are on red alert.普利茅斯所有的医院都处于紧急状态之中。...