Question

I wanted mother's present to be secret,but my sister letthe cat out of the bag.是什么意思

还有一些
I wanted mother's present to be secret,but my sister letthe cat out of the bag.
He was like a cat in hot bricks before his driving test.
The pian is a dead duck:there is no money.
My new car goes like a bird.It runs fairly well.
You can talk till the cows come home;you"ll never make me change my mind.
I smelt a rat when he started being so helpful.
They lead a cat-and-dog life，so they decided to get separated.

Answer 1

I wanted mother's present to be secret,but my sister letthe cat out of the bag.
我想送妈妈一个惊喜的礼物，但姐姐却不小心泄露了秘密。let the cat out of the dog 无意中泄露秘密

He was like a cat in hot bricks before his driving test.
在考驾照之前他像热锅上的蚂蚁一样不安。 cat on hot bricks (应该是0n,不是in) 热锅上的蚂蚁

The pian is a dead duck : there is no money.
是不是“The plan is a dead duck : there is no money.”？
这个计划泡汤了：我们没有钱。a dead duck 完蛋了

My new car goes like a bird. It runs fairly well.
我的新车开起来很轻松，它跑起来太棒了。goes like a bird 很轻松地

You can talk till the cows come home ; you’ll never make me change my mind.
你可以一直说下去，但我是不会改变主意的。 till the cows come home 长时间 永远

I smelt a rat when he started being so helpful.
当他开始变得乐于助人的时候我感到不妙。smelt a rat 感觉不妙

They lead a cat-and-dog life，so they decided to get separated.
由于过着争吵不休的生活，他们决定分居。a cat-and-dog life 争吵不休的生活

Answer 2

1.I wanted mother's present to be secret,but my sister letthe cat out of the bag.给妈妈的礼物我本想保密，但妹妹却露出了马脚
2.He was like a cat in hot bricks before his driving test.
面临驾驶考试，他急得像热锅上的蚂蚁
3.The pian is a dead duck:there is no money.
计划黄了，因为没有钱。
4.My new car goes like a bird.It runs fairly well.
我的新车行驶自如，它跑得非常好。
5.You can talk till the cows come home;you"ll never make me change my mind.
你就算说出大天来，也休想改变我的主意
6.I smelt a rat when he started being so helpful.
他主动帮忙，我怀疑里面另有文章
7.They lead a cat-and-dog life，so they decided to get separated.
他们老是吵架，所以决定分开。

Answer 3

我想给妈妈一个惊喜，但姐姐把消息透露出去了。

Answer 4

我想让妈妈的到场保密，但是我的妹妹走漏了风声。