Subproblem tree
[计] 子问题树
🧩 词语组成解析
[计] 子问题
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）;
🗣️ 情景例句
You may be offered coffee, and then you should immediately announce the reason for your visit.
他们会给你冲咖啡，然后你应该尽快说明来意。
To operate a steam locomotive
驾驶蒸汽机车
We have a problem.
出问题了。