When something is convex, it curves out towards you — like the outside of a ball, or the front of your eye. Convexity is that outward curve, or the fact of having it.

When something is convex當某個東西是凸的時候 it curves out towards you它會朝你的方向凸出 like the outside of a ball就像球的外側 or the front of your eye或是你眼睛的前面 Convexity凸性 is that outward curve就是那種向外凸的曲線 or the fact of having it或是擁有這種凸出特性這件事

You meet the word most in maths, science, and design: a convex lens is thicker in the middle and can bring light together; a convex mirror bulges out and makes things look smaller. The everyday opposite is a hollow, bowl-like curve.

in maths, science, and design在數學、科學和設計裡 You meet the word most你最常遇到這個詞 a convex lens凸透鏡 is thicker in the middle中間比較厚 and can bring light together可以把光線聚在一起 a convex mirror凸面鏡 bulges out向外凸出 and makes things look smaller會讓東西看起來比較小 The everyday opposite日常生活中相反的說法 is a hollow, bowl-like curve是凹陷、像碗一樣的曲線

Though actually, specialists also stretch convexity onto graphs and even onto money maths, where it names how a line or a price bends — still the same “curves out” picture, just drawn on paper. For most learners, the physical shape is the meaning that matters, and it is a calm, technical word, not an everyday one.

Though actually不過其實 specialists also stretch convexity onto graphs專家也會把convexity這個詞延伸用在圖表上 and even onto money maths甚至用在金融數學裡 where it names how a line or a price bends用來說一條線或一個價格怎麼彎 still the same還是同樣 "curves out"「向外凸」 picture的畫面 just drawn on paper只是畫在紙上而已 For most learners對大多數學習者來說 the physical shape is the meaning that matters物理形狀才是重要的意思 and it is a calm, technical word而且這是一個平靜、專業的詞 not an everyday one不是日常用詞