Concave polyhedron
凹多面体
🧩 词语组成解析
concave
['kɔn'keiv]
n. 凹面，成凹形;
adj. 凹的;
vt. 使成凹形;
n. 多面体
🗣️ 情景例句
where would you choose to spend our anniversary?
会选哪里去度我们的结婚周年纪念日
She refuses to make up her mind.
她拒绝下决心。
It was a Sunday in May. My brother and I had decided to go off for a long walk while we were staying with my grandparents in the French countryside.
5月的一个星期天，我和弟弟决定去远足。当时我们住在法国乡下的祖父母家中。