But I'll beabag 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。
2
I wanted it to bea 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》
3
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.