But I'll be a bag of bones, Driving down the road along.

但是我会成为一个装着尸骨的包裹，独自行驶在马路上。

youdao

I wanted it to be a surprise, but my sister let the cat out of the bag.

我想给大家来个惊奇，可我妹妹却先说漏了嘴。

《牛津词典》

Sometimes a market trader would put a cat in his bag and pretend it was a pig to fool the customer! So if someone lets the cat out of the bag, the secret would be open to us.

有时一个市场商人会把一只猫放在他的包里，假装它是一只猪来愚弄顾客！所以如果有人让猫从包里出来，秘密就会为我们所知。

youdao

If you tell about something that was supposed to be a secret, we say you let the cat out of the bag.

VOA: special.2009.09.27

For those of you who are on the run from the FBI, your Visa has run out, or you're sitting next to your ex-girlfriend, now would be a good time to put a paper bag over your head.

被FBI通缉的,签证失效的,还有前女友就坐在旁边的,赶快找个纸袋子把脸给蒙上

耶鲁公开课 - 博弈论课程节选

Software can be added to identify things that are not usually there, like a bag left on a bench.

VOA: standard.2010.04.01

It might as well be a bag of flour.

FORBES: Are You Trying to Eat Better?

If you went to a fast food restaurant and purchased a packet of fries and a burger then the fries can be placed in a free bag as they are only part wrapped and you would not be expected to place these in a reusable bag as there could be some food safety risks.

BBC: Quiz: When do you have pay for a carrier bag in Wales?

Will it be a success like the merger that created Novartis or will it be a mixed bag like the deals that created Pfizer and GlaxoSmithKline?

FORBES: Should Merck Have Bought Schering-Plough?