afternoon 词根是noon,词缀是after
例句
1、
Our system should be up by this afternoon.
到今天下午,我们的电脑系统应该运行起来了。
2、
Where were you on the afternoon of May 21?
5月21日下午你在哪里
3、
I saw her one afternoon last week.
我在上周的一个下午见到了她。
afternoon词根词缀
after- 表示……之后,noon-表示中午。所以afternoon=中午以后=下午。
noon = n.中午,正午
例句:
A day goes through daybreak, morning, noon, afternoon, evening and midnight.一天经过拂晓,上午,正午,下午,傍晚和午夜.
类似的词根词缀还有:
nor = conj./ad.也不,也没有
No, nobody's body is noble, nor is his.不,没有任何人的躯体是高贵的,他的也不是.
norm = n.准则,规范,准则,平均数n.规范,行为准则[norm=rule,norm,表示"规则,规范"]
normal = a.正常的,普通的正规的,标准的He did not seem normal.他精神似乎不正常.a.正常的(norm+al→有规范的→正常的)
[norm=rule,norm,表示"规则,规范"]
normalization = n.(normalisation)
正常化,标准化n.正常化(mormal正常的)
north = n.北,北方a.北方的,北部adj.向北方,在北方
例句:
Henceforth, the north wind is worthless to the northerners.从今以后,北风对北方人没有益处.
northeast = n.东北a.东北方的ad.向东北,在东北
例句:
The bird nests only in northeast, northwest, southeast and southwest lest it be found.此鸟只在东北,西北,东南和西南筑巢,以免被发现.
northeasten = a.东北方的[-ern①表形容词,"…方向的"②表名词,"…场所"]
northeastern = 东北方的-ern 
1、表形容词"…方向的Ŗ.表名词"…场所"]
(1)
表形容词,”…方向的” eatern :东方的,westem :西方的,southern : 南方的,northeastren a 东北方的
satern n 盐场(salt盐)
northern = a北方的,北部的
She has traveled in most northern countries.她曾游历过北方诸国.
northward = a向北的(north北)
northwest = n.西北方,西北部a.西北的ad.向西北,在西北
如:
The bird nests only in northeast, northwest, southeast and southwest lest it be found.此鸟只在东北,西北,东南和西南筑巢,以免被发现.