Concave tree of region
[计] 区域凹树
🧩 词语组成解析
concave
['kɔn'keiv]
n. 凹面，成凹形;
adj. 凹的;
vt. 使成凹形;
tree
[tri]
n. 树;木料;树状图;宗谱;
vt. 把…赶上树;使处于困境;把鞋型插入（鞋内）;
of
[əv]
prep. 关于;属于…的;由…制成;
aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气];
🗣️ 情景例句
I decided to forget about my accounting problems
我已决定不再去想那些会计上的问题
Nothing so bad but might be a blessing.
塞翁失马，焉知非福。
Goodness me! Six zeros! I've never seen anything like this before.
天啊！带六个零的大钞！我还从来没有见过这样大的钞票。