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请教四个英语句子一:killing a small but significant number of cells di

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请教四个英语句子
一:killing a small but significant number of cells directly.
其中significant number of怎么翻译呢?
二:Agricultural research has developed much faster on plants than animals.And there is insufficient reason to expect that if species patents on plants are upheld,the practice of granting such patents will be restricted to them.It seems from developments so far that the blitzkrieg is inching its way to higher life forms.
其中blitzkrieg原意是闪电战,这里指什么?
三:Broadly worded patent rights (as in the case of cotton or soybean),or the taking out of a large n umber of patents effectively suppress competition through the threat of infringement suits.
taking out of如何翻译?
四:Utility patents also prohibit farmers from the common practice of saving and using seeds from previous crops or from breeding animals,as well as restricting research exemptions.
restricting往上接哪个from?
第一个significant表示important,重要的.说明细胞数目虽少,但是很重要
第二个,blitzrieg表示的是前面提到的develop much faster.表示高等动物的研究速度同样在加快.
第三个,查了下,貌似表示合法取得.(iciba的)仅供参考
第四个:应该是第一个from,就是接prohibit后面的那个from.