N a person who is addicted to heroin 海洛因上瘾的人 [英国英语] [slang]
He was transferred to a regular room, and the first thing he did was smack his head on the door.
他被转入了普通病房，他在那儿做的第一件事就是用头叩门。
Take a look of their giant PAWS, one smack can rip your head right off.
看看它那巨大的爪子吧，只需要轻轻一拍，就会顿时令你脑浆迸裂。
There is the arrival into Freetown, with the city's endlessly chaotic roads, traffic, and noise. Everything you imagine about urban Africa hits you smack in the face when you head downtown.
到了首都弗里敦，进城的时候，你能想象到的非洲城市的一切向你迎面扑来：混乱的道路，阻塞的交通，高分贝的噪音。
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