by的用法Count your age by friends,not years.Count your life by smiles,not tears.这句话是不是有错误?by smiles为什么要加s?是因by后面要跟单数吗?那 friend为什么又加s?Count your age by friends,not years.Count your life by s

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by：prep.被；经由；在……之前；在附近；依据；通过
adv.经过；通过；附近；[域]白俄罗斯
by在这里是经由、依据、通过的意思.后跟复数是因为,smile与friend都是可数名词.

是getElementsByTagName 而不是getElementByTagName，getElementsByTagName是获取一组相同标签名得对象，返回值是一个数组 .twoColFixLt #container {height:600;

by 后面不是一定要跟单数，这里的smile是具体化的，比如water是没有复数的当水讲的时候，但是作为水域就可以加s。这里的smile的意思跟以下里的weekend用法一样：i visit my aunt every weekends.星期天讲是不可数的，但是具体语境中就要具体化了。

by的用法Count your age by friends,not years.Count your life by smiles,not tears.这句话是不是有错误?by smiles为什么要加s?是因by后面要跟单数吗?那 friend为什么又加s?Count your age by friends,not years.Count your life by s “Count your age by friends ,not years .Count your life by smiles ,not tears.” 一些关于介词的用法at the age of by the age of有什么区别 selete the best time from your life to go to the place where you liked order by your age group by the stage of your life having count(*) the more the best age的形容词用法是什么? by the age of,at the age of的区别? at the age of的用法这句话对吗?关于whether的用法Whether to study or to play is more important depends on your age. count函数具体用法 in the age of by the age of at the age of的区别in the age ofby the age ofat the age of的区别 by your favour用法简洁例句, What's your age?的同义句 what is your age的同义句 What's your age的答语是什么? Count your怎么读 count your blessings是什么意思英语by的用法 by 的用法