表达 “as snug as a bug in a rug” 的字面意思是 “像裹在毯子里的虫子一样舒服”，它实际用来形容某人 “感到非常温暖、惬意和舒适”。在室外天气非常寒冷的情况下，这个表达可以突出强调某人呆在温暖的室内，“感到很舒适”。这个表达也可以被缩略为 “as snug as a bug”。

例句
It's really cold outside, but Jethro is inside wrapped in a warm blanket and drinking hot chocolate. He's as snug as a bug in a rug.
外面真的很冷，不过杰思罗在屋子里裹着一条暖和的毯子，喝着热巧克力。他舒服极了。

Put on a warm jumper and grab your gloves! You'll be as snug as a bug.
穿上一件暖和的套头毛衣，戴上手套！你会感到既温暖又舒适。

I'm not getting out of bed. The room is freezing. I'm as snug as a bug in a rug wrapped up in my duvet.
我不想起床。这个房间冷极了。我裹在被窝里，非常舒服。