Ten times as much, or ten times as many.

Ten times as much十倍那麼多，or ten times as many或十倍那麼多個。

It works two ways in a sentence. As an adjective before a noun: a tenfold increase, a tenfold rise in prices. As an adverb after a verb: sales increased tenfold, the population grew tenfold. Both are common; the adverb use feels slightly more natural in speech.

It works two ways in a sentence它在句子裡有兩種用法。As an adjective before a noun當形容詞放在名詞前面：a tenfold increase一個十倍的增加、a tenfold rise in prices物價十倍的上漲。As an adverb after a verb當副詞放在動詞後面：sales increased tenfold銷售增加為十倍、the population grew tenfold人口成長為十倍。Both are common兩種都很常見；the adverb use feels slightly more natural in speech不過副詞用法在口語裡感覺更自然一點。

What makes it worth learning is that it is a whole family, not one word — twofold, threefold, fivefold, a hundredfold all work the same way, and once you see the pattern you own all of them.

What makes it worth learning is that it is a whole family, not one word值得學的地方在於，它是一整個家族，不是單一個字——twofold, threefold, fivefold, a hundredfold all work the same waytwofold、threefold、fivefold、a hundredfold全都是一樣的用法，and once you see the pattern you own all of them一旦你看懂這個規律，你就等於學會了全部。

The word is a bit formal, and it lives where numbers live: reports, news, science writing, business talk. One thing English does here that Chinese does differently: tenfold means the new amount is ten times the old one, so 100 becoming 1,000.

The word is a bit formal這個字有點正式，and it lives where numbers live而且它常出現在跟數字有關的地方：reports報告、news新聞、science writing科學寫作、business talk商業談話。One thing English does here that Chinese does differently英文在這裡有一點跟中文不一樣：tenfold means the new amount is ten times the old onetenfold的意思是新的數量是舊的十倍，so 100 becoming 1,000也就是100變成1,000。

Careful writers use it for increases far more often than decreases — "decreased tenfold" is heard, but many readers find it awkward and prefer "fell to a tenth." People also stretch it to things you cannot count: "her confidence grew tenfold" does not mean anyone measured it; it means a lot. That looser use is normal in speech but a bit much in formal writing.

Careful writers use it for increases far more often than decreases細心的作者用它來講「增加」遠多於「減少」——"decreased tenfold" is heard"decreased tenfold"這種說法聽得到，but many readers find it awkward and prefer "fell to a tenth."不過很多讀者覺得這樣講很彆扭，比較喜歡"fell to a tenth"這種說法。People also stretch it to things you cannot count大家也把它延伸用在無法計數的東西上："her confidence grew tenfold" does not mean anyone measured it"her confidence grew tenfold"並不是說有人真的量過，it means a lot意思只是「多了很多」。That looser use is normal in speech這種比較鬆散的用法在口語裡很正常，but a bit much in formal writing但在正式寫作裡就有點過頭。