沒有對比的意思,since意思是自從……時候,例如:
1、You've grown since the last time I saw you!自從我上次見到你後,你又見長了!
2、She's a changed woman since she got that job.她自從得到了那份工作,變得判若兩人。
3、I've lost six and a half pounds since I started my diet.從節食以來,我體重已減輕了六磅半。