I've had the hots for him ever since he arrived.

自从他来到后，我就迷恋上他了。

《柯林斯英汉双解大词典》

He has been collecting stamps since he was eight.

他从八岁开始集邮。

《牛津词典》

Since he changed jobs he's looked like a new man.

他跳槽之后像换了一个人似的。

《牛津词典》

And,he says the subject of oceans interests him especially because he has been scuba diving since he was a child.

VOA: special.2009.03.25

It's late for some personal reasons as well. Milton had been, as you know, anticipating writing this poem since he was at least nineteen years old.

也有一些个人原因，你们知道，弥尔顿至少在19岁的时候就想要写这样一首诗了。

耶鲁公开课 - 弥尔顿课程节选

And so to see somebody so prolific and who's been that way since he was a teenager, I mean,

所以，（我们）看到这样一个从青年时期就多产的作家，我的意思是，

和男朋友在一起 - SpeakingMax英语口语达人

In the 23 years since he founded the company, he has bought and sold historical documents.

FORBES: Swept Up

Brown has been battling a perception problem about his company since he returned in February as chief executive.

FORBES: Facing Downgrade, MBIA Comes Out Fighting

He's been working at this company for 46 years, ever since he graduated high school.

NPR: Hurricanes Deal Sugar Industry a Serious Blow