學個詞：＂Six-pack＂

In English the phrase six-pack originally refers to a way of selling cans of beer – buying six cans joined together with plastic holders. And now, as a slang expression, it can also describe the shape of stomach muscles... on people who are very fit you can see six round muscles – which looks like a six pack of drink. 

Examples：

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I've been going to the gym for a month now. I need to get my six-pack ready before I go to the beach this summer!

I used to have a six-pack when I was a teenager, but it seems to have got lost under all this fat.

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＂Six-pack＂在英文裡最初的意思是指＂六罐裝＂的啤酒。但現在在俚語的表達上，我們可以說＂六塊肌＂，在身材健美的人，腹部會有的六塊腹肌，主要是因為它看起來的樣子。 那身材不好，You have a one-pack – one huge beer belly! 所以大部份的人應該都是one-pack吧！也就是擁有＂beer belly＂啤酒肚！

From BBC learning English