记忆方法
将“concave”拆解为“con-”和“cave”。想象一个洞穴“cave”向内凹陷，形成“con”表示的方向，于是整个单词“concave”就形象地表示了向内凹陷的形状。
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中文词源
concave 凹状
con-, 强调。-cave, 洞穴。洞穴状的，凹进去的。
英语词源
- concave (adj.)
- early 15c., from Old French concave (14c.) or directly from Latin concavus "hollow, arched, vaulted, curved," from com-, intensive prefix (see com-), + cavus "hollow" (see cave (n.)).
权威例句
- 1. The palm of one's hand is slightly concave.
- 人的手掌是微凹的.
- 2. The graph of a concave function is always below its tangent.
- 一个凹函数的图象总在它的切线的下方.
- 3. The cloven hooves are sharp edged , elastic and concave.
- 蹄锋利,呈凹形, 富有弹性.
- 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.