But while these "cover",or fertilizer,crops are growing,food crops have to be grown on other land.这句话的语法点是什么?总是翻译错

But while these cover,or fertilizer,crops are growing,food crops have to be grown on other land.这句话的语法点是什么?总是翻译错 but yet while however 区别 and but or while区别 but和while的区别 while 与but的区别 while和but的区别 yet however but while 的区别 however,yet,but,while之间的关系 however while but 的区别是什么呢 从but however while中选词填空 while 和but不同有什么区别 silent all these years 的中文歌词[ti:silent all these years][ar:孙燕姿][al:孙燕姿自选集][by:longleylau][offset:400][00:01.04]Silent all these years[00:05.46][00:06.46][00:07.46][00:08.46]excuse me but can I be you for a while[00:11.98]m Just be for a while.These things take time but however..区别是什么but however yet while 区别是什么 cov(x,y)=? 概率论COV(2, _____students like English ,while _____ones like science.A.these,those Bthose,these 英语语法填空 but 和 while 区别!急 明天就考试了!英语 语法填空but 与while 如何更好区分什么时候用but 什么时候用while