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
He began to seek jobs in the classified advertisement column in the newspaper.
他开始从报纸的分类广告栏找工作。
What will the weather be like tomorrow?
明天天气怎么样？
Not realizing who she was, the assistant was eager to serve her this time.
那个售货员没有认出她是谁，这一回接待她的态度非常殷勤。