A best-seller is something that a huge number of people buy. We use it most for books: a novel on a “best-seller list” is one that is selling very fast this week.

a best-seller 暢銷書 is something that a huge number of people buy 是指有非常多人買的東西。most for books 大部分用在書上 we use it 我們這樣用：a novel on a 'best-seller list' 上「暢銷排行榜」的小說 is one that is selling very fast this week 是指這星期賣得非常快的那本

Though actually, “best” here does not mean the book is the finest one ever written. It only means many people paid for it. A thin holiday cookbook or a noisy children’s story can be a best-seller.

though actually 不過其實 'best' here does not mean the book is the finest one ever written 這裡的「best」不是說這本書是史上寫得最好的。it only means many people paid for it 它只是說很多人花錢買了它。a thin holiday cookbook or a noisy children's story 一本薄薄的節日食譜，或一本吵鬧的童書 can be a best-seller 都可能是暢銷書

You will also see it written as one word, bestseller, or as two words, best seller; all three are used.

as one word, bestseller, or as two words, best seller 寫成一個字 bestseller，或兩個字 best seller you will also see it written 你也會看到這種寫法；all three are used 三種寫法都有人用

Shops stretch it past books to anything that flies off the shelf — a perfume, a toy, a phone. It is everyday English with a shop-window feel, not a school-science word.

past books to anything that flies off the shelf 從書延伸到任何賣得很快的東西 shops stretch it 商店會把這個詞用得更廣 — a perfume, a toy, a phone 一瓶香水、一個玩具、一支手機都算。it is everyday English with a shop-window feel 這是帶點櫥窗味的日常英文，not a school-science word 不是學術性的用字