Concavo-convex
a. 凹凸的, 一面凹一面凸的\\n[化] 凹凸的
?? 詞語組成解析
convex
['k?n'veks]
adj. 凸的，凸面的;凸?fàn)?凸形;
??? 情景例句
Oh, no sir. We already gave you a discount on each item.
哦，不行，先生。每一件東西我們都給你打過折扣了。
Each day brings its own bread.
天無絕人之路。
Past experience has taught us that certain accomplishments are beyond attainment.
以往的經(jīng)驗(yàn)告訴我們有些事是辦不到的。