出气筒的英文：
punching bag

参考例句：

That day the minister's clerks and the subordinates had a great deal to put up with from his ill-humor.
那天，部里的职员，他的下属都成了他的出气筒。

What have the kids done to provoke you? Why should you take it out on them?
孩子们没招你惹你的,你干吗拿他们当出气筒

And at length even Pluto began to experience the effects of my ill-temper.
最后，我索性把普路托也当做出气筒了。

"She's plain doormat, for even every member of her family would treat her like dirt."
她简直就是个出气筒,连家里人都不把她当回事。

punching是什么意思：
v. 用拳猛击，用肘推；打孔；按，压；戳，刺
n. 猛击；冲压机，冲床；打洞器，钻孔机；影响力，效力；潘趣酒

To punch or strike.
用拳猛击或击打

I was lightly punched by a stranger.
我被一个陌生人轻轻地打了。

He rolled with a punch.
他因受了一拳而左右摇晃。

bond extracting punch
导接线撤出冲头

punch a man in the face
用拳猛击某人的脸

bag是什么意思：
n. 手提包；纸袋；大量；眼袋；猎获物
v. 把...装进袋子；捕杀；得分；抢占，占有

stuff a Bag with things
把袋子装满东西

Give the porter your bag.
把你的提包交给搬运行李的人。

He stroked the ball into the bag.
他轻轻一触，球就进袋了。

We bagged the wheat.
我们把小麦装入口袋。

You start with a bag full of luck and an empty bag of experience. The trick is to fill the bag of experience before you empty the bag of luck.
开始时你有两个袋，运气袋装得满满的，经验袋是空空的。关键就在于，在运气袋变空之前，请把经验袋装得满满的！