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。

　　She's been using since she was 13.

　　她從13歲起就吸毒。

　　His quality of life has improved dramatically since the operation.

　　手術(shù)后他的生活質(zhì)量大大改善了。

　　It's a long time since they left.

　　他們已經(jīng)離開(kāi)很久了。

　　It's been two weeks now since she called.

　　她到現在已經(jīng)有兩個(gè)星期沒(méi)來(lái)電話(huà)了。