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.)).
雙語例句
1. The palm of one's hand is slightly concave.
人的手掌是微凹的.
來自《現(xiàn)代漢英綜合大詞典》
2. The graph of a concave function is always below its tangent.
一個凹函數(shù)的圖象總在它的切線的下方.
來自辭典例句
3. The cloven hooves are sharp edged , elastic and concave.
蹄鋒利,呈凹形, 富有彈性.
來自辭典例句
4. Alternative characterization of concave and convex functions which is sometimes useful.
對于凹函數(shù)和凸函數(shù)還有一個替補的表征,有時它是有用的.
來自辭典例句
5. In adults its contour may be straight, slightly concave or slightly convex.