the first bicycle appeared about two hundred years ago.这句话的意思!

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• I have known him for two years.为啥不对?I knew him two years ago,过去式,只能说明,你在两年前是认识他的,或表达我在两年前就已经认识他了.你们俩个到底什么时候初次认识对方的,这句话里没有表达清楚.最常用地道的表达“我两年前（初次）认识他的”是：I got to know him two years ago."get to know"就有初次认识的意思了.或者用完成时,换一种方法说,我们是朋友已经两年了,We have been friends for two years.“I met him two years ago.”跟I knew him two years ago类似,还是不对的.只能说明你两年前遇见他.不能说明你们什么时候最初认识.如果要用met,应该加上first,I first met him two years ago,就清楚的表达出我最初是两年前见到他的.know 状态性动词,它后面可以跟表示时间延续的状语.meet 终止性
• the first bicycle appeared about two hundred years ago.这句话的意思!
• the first bicycle appeared about two hundred years ago.
• 定语从句中That,which,where 等的用法我看了一些参考书有关于定语从句的用法,但是有一点我不明白,书上说：“先行词为表示时间、地点的名词时,关系词不一定都用when或where.如果关系词在定语从句中作主语或宾语时,就要用关系代词WHICH或WHAT.”这句话是不是绝对的啊,是不是遇到这种情况都要这样处理啊?如果是那么这书上有几句话我不明白.1、This is the factory that/which we visited last year.2 I won't forget the time that we spent in the countreside.以上两句是按上面的意思的,可是下面一句为什么还是用WHERE?this is the house where i lived two years ago.
• The first hundred years are the hardest.如何翻译
• joseph niepce took the first photograph two hundred years ago.in 1844 george eastman was the first person to put a photograph on paper.now we look at most of our photographs oncomputers什么意思?