记忆方法
记忆“convex”可以采用字形相似法，将其与“con”和“ vex”结合。想象“con”代表向内的“紧”，而“vex”代表“烦恼”，但通过一个透明的、弯曲向上的表面（凸面）可以消除烦恼。这样，“convex”可以联想为一种光滑向外凸出的形状，具有解忧的特性。
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中文词源
convex 凸透镜
con-, 强调。-vex, 同-vect, 携带，移动，词源同vector, vehicle. 即在拱顶汇集的，形成凸透镜形状的。
英语词源
- convex
-
convex: [16] Convex was borrowed from Latin convexus, mainly an architectural term meaning ‘arched, vaulted’. The element -vexus probably came from vehere ‘carry’ (source of English vehicle), the notion being that vaults are ‘carried together’ (Latin com- ‘together’) to meet at a point at the centre of a roof, although some have speculated that it is related to Latin vārus ‘bent, knock-kneed’ (source of English prevaricate).
=> vehicle, vex - convex (adj.)
- 1570s, from Middle French convexe, from Latin convexus "vaulted, arched," past participle of convehere "to bring together," from com- "together," or "thoroughly" (see com-) + vehere "to bring" (see vehicle). Possibly from the idea of vaults carried together to meet at the point of a roof. Related: Convexity. Convex lens is from 1822.
权威例句
- 1. I wouldn't say your stomach was big — it's just slightly convex.
- 我不会说你的肚子大——它只是有点凸出.
- 2. Its convex border should project far into the right lower lung field.
- 其凸出缘应深深地突入右下肺野内.
- 3. A convex lens is used to concentrate rays of light.
- 凸透镜用于聚集光线.
- 4. Alternative characterization of concave and convex functions which is sometimes useful.
- 对于凹函数和凸函数还有一个替补的表征,有时它是有用的.
- 5. In adults its contour may be straight, slightly concave or slightly convex.
- 成人肺其形状可以是直的, 轻微凹下或轻度突出.