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In boxing, a fighter in the weight class up to 72.58 kg (160 pounds) — heavier than a , lighter than a light heavyweight. Boxers are put into classes by weight so that fights are fair, and 'middleweight' is one of the most famous of these, the class of many great champions.
In boxing在拳擊裡 a fighter指的是一位選手 in the weight class up to 72.58 kg (160 pounds)體重上限72.58公斤（160磅）的量級 heavier than a welterweight比welterweight重 lighter than a light heavyweight比light heavyweight輕 Boxers are put into classes by weight拳擊手是依體重分級的 so that fights are fair好讓比賽公平 and 'middleweight' is one of the most famous of these而「middleweight」是其中最有名的量級之一 the class of many great champions是許多偉大冠軍所屬的量級
The word is used as a noun ('he turned professional as a middleweight') and in front of another noun ('the middleweight title', 'a middleweight contest').
The word這個字 is used as a noun可以當名詞用 ('he turned professional as a middleweight')（像'he turned professional as a middleweight'，他以middleweight身分轉為職業選手） and in front of another noun也可以放在另一個名詞前面 ('the middleweight title', 'a middleweight contest')（像'the middleweight title'冠軍頭銜、'a middleweight contest'比賽）
The same class names are used in other fighting and lifting sports, though the exact differ from sport to sport, so the number is not fixed everywhere.
The same class names同樣的量級名稱 are used in other fighting and lifting sports也用在其他格鬥和舉重運動裡 though the exact kilograms differ from sport to sport雖然確切的公斤數每個運動不太一樣 so the number is not fixed everywhere所以這個數字並不是到處都固定的
Outside sport, people use it to mean something of middle size, middle power or middle importance — 'a middleweight laptop', 'a middleweight player in the industry'. That use is informal and usually a little , meaning 'good but not top'.
Outside sport在運動之外 people use it大家會用這個字 to mean something of middle size, middle power or middle importance來指中等尺寸、中等力量，或中等重要性的東西 'a middleweight laptop', 'a middleweight player in the industry'（像'a middleweight laptop'中等規格的筆電、'a middleweight player in the industry'業界的中型玩家） That use這種用法 is informal and usually a little dismissive是口語的，通常帶點輕視 meaning 'good but not top'意思是「不錯，但不是頂尖」
Note it is not simply a person of average weight: a middleweight boxer is a trained athlete, and calling an ordinary person a middleweight would only make sense as a joke.
Note要注意 it is not simply a person of average weight這不只是單純指體重中等的人 a middleweight boxer一位middleweight boxer is a trained athlete是受過訓練的運動員 and calling an ordinary person a middleweight而把一個普通人稱作middleweight would only make sense as a joke只有當玩笑講才說得通
組成middle (中間) + weight (重量)，就是「中間的重量等級」。
同家族的字
- heavyweightsame '-weight' class pattern — the heaviest fighters
- welterweightsame '-weight' class pattern — the class just below
- lightweightsame '-weight' class pattern — and also means 'not important'
- weightthe same 'weight' — how heavy something is
原始詞典資料4 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
middleweightnoun
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A weight class in professional boxing between light middleweight or welterweight and super middleweight or cruiserweight; a similar division in wrestling and other sports
- 2
A boxer who fights in this division; a similar wrestler etc
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A class in between heavy and light.
- This would give the U.S. Army five parachute-capable brigades, or two "middleweight" infantry brigades, or six light infantry brigades, or six airmobile brigades in only two multicapable divisions.
- In Ukraine, jaeger brigades are middleweight infantry—neither as light as territorial brigades, which generally lack tracked vehicles, nor as heavy as tank or mechanized brigades with their hundreds of tanks and fighting vehicles.
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businessAn employee ranking anywhere between junior and senior.
- And it's interesting because in a way they're much more of a design company, and they've got their juniors and their seniors and their middleweights and all this stuff.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。