1.jacket的基本意思是“带袖的短上衣”“夹克衫”,也可作“马铃薯皮”“书籍的护封”解。
2.jacket是可数名词,有复数形式。

He has a blue jacket on.他穿着一件蓝色上衣。
It's in my jacket pocket.它在我上衣口袋里。
Waiters in white jackets arrived with drinks.穿白色短上衣的侍者们端来了饮料。
A man's three-piece suit includes a jacket, trousers, and a waistcoat.男人的三件套服装包括上衣、长裤和背心。
Your jacket is wet through.你的夹克湿透了。
He had a patch on the elbow of his jacket.他的夹克衫肘部有一块补丁。
He wore brown trousers and a blue jacket.他穿着棕色的裤子和蓝色的夹克衫。
I like the design on this book jacket.我喜欢这本书封面上的图案。

［词源］  ＜古法语jaquet(短上衣)