I must have drifted off, because when I woke we were nearly home.

我一定是睡着了，因为我醒来时我们已快到家了。

《牛津词典》

I didn't hear the storm. I must have drifted off by then.

我没有听见暴风雨，那时一定是睡着了。

《牛津词典》

We found that if a prototype didn't have clear, measurable goals, it quickly drifted off into "Look what I can do."..

我们发现如果原型没有清晰的、可测量的目标，它很快就会沦落到“我能做什么…”。

youdao

Each night, I drifted off to sleep to the roar of motorcycle traffic below.

WSJ: Kati Marton on Her Lifelong Therapist: Paris

At this stage I was so relaxed and comfortable with my highly competent therapist, I drifted off a bit and dozed.

CNN: Pamper yourself: Mandarin Oriental