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be a bestseller
bestseller 是可数名词，复数形式为 bestsellers；be a bestseller 表示“是畅销书”，常用于说明某本书销量很大。
The book is a bestseller.
这本书是畅销书。
畅销书
bestsellers — plural of bestseller
先理解核心含义，再看它在真实句子里的用法。
畅销书
a book that has sold many copies very quickly
The book is a bestseller.
这本书是畅销书。
销量很大的书或其他产品；畅销品。
A book or other product that has sold in large numbers.
Her new novel became an instant bestseller.
她的新小说立刻成了畅销书。
The book stayed on the bestseller list for over a year.
这本书在畅销书排行榜上停留了一年多。
The author has written several bestsellers.
这位作者写了好几本畅销书。
bestseller 是可数名词，复数形式为 bestsellers；be a bestseller 表示“是畅销书”，常用于说明某本书销量很大。
The book is a bestseller.
这本书是畅销书。
become a bestseller 表示“成为畅销书”，强调从普通到畅销的变化。
Her novel quickly became a bestseller.
她的小说很快就成了畅销书。
Not this
This is a bestseller book.
Use this
This is a bestselling book.
bestseller 是名词，不能直接修饰名词；修饰名词应用形容词 bestselling。
Not this
There are many bestseller in the bookstore.
Use this
There are many bestsellers in the bookstore.
bestseller 是可数名词，复数形式为 bestsellers，表示多本畅销书时应用复数。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
畅销书排行榜
Her novel has stayed on the bestseller list for a year.
她的小说在畅销书排行榜上保持了一年。
畅销书地位
The book achieved bestseller status within a month.
这本书在一个月内就获得了畅销书地位。
迅速走红的畅销书
The memoir was an instant bestseller.
这本回忆录一出版就成为畅销书。
国际畅销书
The novel was an international bestseller.
这部小说是一部国际畅销书。
火爆畅销书
The cookbook became a runaway bestseller.
这本食谱成为了一本火爆畅销书。
谋杀是他最畅销的作品。
The movie tagline 'Murder is his best seller' is a pun on the word 'bestseller'.
电影标语“Murder is his best seller”是对“bestseller”一词的双关。
Use bestsellers naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
把 bestseller 拆成 best（最好）+ seller（卖得多的），脑子里想“卖得最好的书”，自然就是畅销书。
语域：neutral 常见场景：出版行业、书评、日常交谈 bestseller 是中性词，本身不带有明显的正式或非正式色彩，通常用于出版、书店、书评以及日常谈论书籍销量等场合。
seller, cellar, teller, speller, stellar 都与 bestseller 的 -seller 押韵，重读元音都是 /ɛ/，后面都是 /l.ɚ/。cellar 和 seller 在多数美式口音中同音。注意拼写相似的 sealer (/ˈsiː.lɚ/) 和 sailor (/ˈseɪ.lɚ/) 与 seller 读音不同。
Dictionary facts from ECDICT, WIKTIONARY.