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By two and a half he knew the alphabet.是什么意思？

By two and a half he knew the alphabet.

两岁半时他已认识全部字母。

相关词汇
by two and half he knew the alphabet

by

prep. 在…旁边，表示方式，由于，经过；adv. 经过，表示保留或保存时用，短暂拜访；

two

n. 两个，两个东西，两点钟，一对；adj. 两个的，我

and

conj. 和，与，而且，于是，然后，因此；

half

adj. 一半的，半个的；n. 半，一半，（啤酒等饮料的）半品脱，（比赛、音乐会等的）半场；adv. 一半，部份地；

he

pron. 他，它，一个人；n. 雄性动物；

knew

v. 知道（ know的过去式 ），了解；

the

art. 指已提到的人（物），指说话人与听者已知的人（物），用于独一无二的事物前，与形容词最高级和序数词连用；

alphabet

n. 字母表，字母系统，入门，初步；
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