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新概念英语第四册23课有5句难理解的句子现在请教下各位

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新概念英语第四册23课有5句难理解的句子现在请教下各位
(1)but two classes may be roughly seen这句话书上解释为,可分为两为为什么这样解释呢?按照我们解释就是两类鸟粗略地能被看见!(2)Any shi that crosses the Pacific is accompanied for many days by the smaller albatross,Which may keep company with the vessel for an hour without visible or more than occasional movement of wing这句话是比较级句子吗?without visible or more than occasional movement of wing想了半天都不知道怎么解释?visible or more (3)The currents of air that the walls of the ship direct upwards,as well as in the line of its course,are enough to give the great bird with its immense wings sufficient sustenance and progress这里的as well as 还有这里的with是不是表示附和的意思,也就是说给了这巨鸟,赋予了它巨大翅膀的浮力和推力?progress查了下字典似乎没有推力的意思(4) It comes nearer to the engines with which man has 'conquered' the air这里的with为什么放在主语之前是不是为了更好的修饰定语从句?(5) It tires not,nor does it boast of its power这句话已经有动词了为什么还加个 does ,目的是想说明什么?
新概念英语第四册23课有5句难理解的句子现在请教下各位
(4) 介词+关系词(which / whom)引导定语从句,可以理解成:It comes nearer to the engines; man has conquered the air with the engines.
(5)表示否定含义的词或短语位于句首时,应该用部分倒装:
比如:I don't know,nor do I care.我不知道,我也不关心.
Never have I seen him before.我以前从没有见过他.