Spot-on means exactly right — not roughly right, but right on the mark. You say it about an answer, a guess, an imitation, a description, a measurement: 'Your guess was spot-on.' It is British and Australian, informal, and it usually turns up as a warm little compliment, often on its own as a whole reply: someone explains something and you just say 'Spot-on.' Americans understand it but rarely say it; they would say 'exactly', 'nailed it', or 'right on the money'.

Spot-on means意思是 exactly right完全正確——not roughly right不是大概對，but而是 right on the mark正中靶心地對。You你 about an answer, a guess, an imitation, a description, a measurement會用它講一個答案、一個猜測、一段模仿、一段描述、一個測量：'Your guess was spot-on.'你猜得完全對。It is它是 British and Australian英式和澳式的，informal口語的，and it usually turns up而且通常是 as a warm little compliment一句溫暖的小稱讚 出現，often on its own as a whole reply常常自己就是一整句回答：someone explains something有人解釋了什麼，and you just say你就只說 'Spot-on.'。Americans美國人 understand it聽得懂 but rarely say it但很少說；they would say他們會說 'exactly'、'nailed it'、or或 'right on the money'。

Two things to notice about how it behaves. First, it does not usually go in front of a noun — you say 'her timing was spot-on', not 'a spot-on answer', though people do break that from time to time. Second, it resists more and most: something is spot-on or it is not, so 'more spot-on' sounds wrong.

about how it behaves關於它的用法，Two things to notice有兩件事要注意。First第一，it它 usually通常 does not go in front of a noun不放在名詞前面——you say你會說 'her timing was spot-on'她的時機抓得剛剛好，not而不說 'a spot-on answer'，though不過 people人們 from time to time偶爾 do break that也會打破這條。Second第二，it它 resists排斥 more and most：something一件事 is spot-on or it is not要嘛完全對、要嘛就不是，so所以 'more spot-on' sounds wrong聽起來是錯的。

It also works as an adverb: 'He landed spot-on in the middle of the target.'

It它 also也 works as an adverb可以當副詞：'He landed spot-on in the middle of the target.'他不偏不倚正落在靶子中央。