Undersized means smaller than it should be, or smaller than normal for its kind. The 'should be' part matters: this is not just 'small', it is small measured against some expected size.

Undersized Undersized means smaller than it should be意思是比應該有的尺寸小 or smaller than normal for its kind或是比同類的正常尺寸小 The 'should be' part matters「應該有」這個部分很重要 this is not just 'small'這不只是單純的「小」 it is small measured against some expected size而是跟某個預期尺寸相比之下的小

An undersized fish is under the legal size limit and must go back in the water. An undersized room is too small for what you want to put in it. An undersized bolt will not hold.

An undersized fish一條 undersized 的魚 is under the legal size limit尺寸低於法定限制 and must go back in the water必須放回水裡 An undersized room一間 undersized 的房間 is too small for what you want to put in it對你想放進去的東西來說太小了 An undersized bolt一根 undersized 的螺栓 will not hold撐不住

It is used about people too, usually about athletes — 'an undersized point guard' means small for that position, and interestingly this is often said with respect, because the player succeeds anyway. Said about a child, 'undersized' sounds clinical and a bit unkind; 'small for his age' is the gentler everyday phrasing.

It is used about people too這個詞也用在人身上 usually about athletes通常是運動員 'an undersized point guard'像「an undersized point guard」 means small for that position意思是以那個位置來說個子偏小 and interestingly this is often said with respect而有趣的是，這樣講常常帶著敬意 because the player succeeds anyway因為這位球員還是成功了 Said about a child用在小孩身上時 'undersized' sounds clinical and a bit unkind「undersized」聽起來很像醫療用語，也有點不太客氣 'small for his age' is the gentler everyday phrasing「small for his age」（依他的年紀來說偏小）才是比較溫和的日常說法

You may also see the spelling 'undersize' with no -d, used before a noun in technical and fishing contexts ('undersize catch'); both spellings are accepted, and -sized is the commoner one. It is a fairly neutral, slightly technical word — engineers, builders, fishing officers and sports writers use it more than ordinary speakers do.

You may also see the spelling 'undersize' with no -d你也可能看到不加 -d 的拼法「undersize」 used before a noun in technical and fishing contexts用在技術性文章和漁業場合裡、放在名詞前面 ('undersize catch')像「undersize catch」（未達尺寸的漁獲） both spellings are accepted兩種拼法都可以接受 and -sized is the commoner one而 -sized 這個拼法比較常見 It它 is a fairly neutral, slightly technical word是一個相當中性、有點技術性的詞 engineers, builders, fishing officers and sports writers工程師、建築師、漁業官員和體育記者 use it more than ordinary speakers do用得比一般人多