I knew him by sight but had never spoken with him.是什么意思？

I knew him by sight but had never spoken with him.

我和他有过几面之缘，但从未说过话。

knew

v. 知道（ know的过去式 ），了解；

例句
She knew who to ask about finding an abortionist.
她知道向谁去打听找一个为人堕胎的。

him

pron. (he的宾格)他；

例句
They said goodbye to him as he got aboard the train at Union Station.
当他在联合火车站登上火车之际，他们向他道别。

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；

例句
...expensive make-up that we saw being advertised by a beautiful model...
我们所见的由一位漂亮模特代言的昂贵化妆品

sight

n. 视力，看见，视野，景象；vt. 看见，发现，瞄准，观察，调准瞄准器；vi. （用仪器）瞄准，观察；

例句
There are places you can take physically handicapped children where staff don't blanch at the sight of a wheelchair.
有些地方你能带残疾儿童去，那里的工作人员不会一看到轮椅就退缩。

but

conj. 但是，而是，除了，只因为；prep. 除…以外；adv. 只，不过，只是，另一方面；n. 借口，推辞，但是，反对；pron. [关系代词，意义相当于 who…not, which…not]；vt. 对…说“但是”；

例句
English food can be wonderful but the normal English diet is abominable.
英国也有美食，只是一般的日常饮食太过糟糕。

had

v. 有（ have的过去式和过去分词 ），（亲属关系中）接受，拿，买到；

例句
He claimed that his parents had abandoned him...
他声称父母遗弃了他。

never

adv. 从不，从来没有，一点也不，决不，<口>不会…吧，没有，不曾；

例句
The public never had faith in his ability to handle the job...
公众从来不相信他有能力胜任这一职位。

spoken

adj. 口头讲的，口头的，口语的，（用以构成复合词）具…说话特点的；v. 讲，谈（ speak的过去分词 ），说，演说，从某种观点来说；

例句
'What do scientists you've spoken with think about that?' — 'Well, to begin with, they doubt it's going to work.'
“跟你聊过的科学家是怎么看的？”——“嗯，首先，他们怀疑这能否行得通。”

with

prep. 和，跟，随着，关于，和…一致；

例句
A waiter entered with a tray...
侍者端着托盘进来了。