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一、详细释义：
adv.
此后；后来
例句：
About six thousand people were arrested, several hundred of whom have since been released.
约6,000 人被捕，后来其中的几百人又被释放了。
例句：
His style of leadership has attracted increasing criticism among his supporters, many of whom have since left Central Office.
他的领导风格已经在他的拥趸中引起了越来越多的批评，很多人后来离开了总局。
conj.
从...以后；自...以来
例句：
I have lived here since I was born.
自打出生，我就住在这儿。
例句：
They have been living on easy street since his business began to prosper.
自从他的生意兴隆以来，他们一直过着优裕的生活。
因为；由于；既然
例句：
Since I am busy, would you attend to the matter for me?
因为我忙，你能代我处理这件事吗？
例句：
I'm forever on a diet, since I put on weight easily.
我永远都在减肥，因为我很容易长胖。
prep.
自...以后；从...以来
例句：
She had a sort of breakdown some years ago, and since then she has been very shy.
几年前她得了神经衰弱，自那以后就变得十分腼腆。
例句：
I've been here since the end of June.
自6月末以来我就一直呆在这儿。
二、词义辨析：
as,because,for,since
这些连词均含有“因为”之意。as从属连词，语意较because,since弱，着重在主句，所表示的原因或理由是“附带的”。because从属连词，语意强，着重直接的原因或理由，所引出的从句是全句的重心，用以回答why提出的问题。for并列连词，语气较弱，所引出的句子一般放在后面，表示附带说明的理由或推断理由。since语意比because弱，但比as强，一般用于表示“由于大家已知的事实”。
三、参考例句：
He has ignored his friends since graduation.
自从毕业后，他就忽略了自己的朋友。【CET-6 2007.06 听力】
He has disappeared for ever since then.
从那以后，他就永远地失踪了。
There has been serious pollution since industrialization.
自从工业化以来就有了严重的污染。
Many centuries have passed since that time.
从那时起，几百年过去了。
Pandas have existed since the dinosaur era.
早在恐龙时代，大熊猫就出现了。
Since when has she taught here?
她从什么时候开始在这儿教书的?
Since then the picture has changed completely.
从那以来情况完全改变了。
I've lived here since childhood.
从小我就留存这里。
Its sales had been brisk since July.
自7月以来销售一直很旺。
We have been friends ever since .
从那以后我们就成了朋友。
游客
