Retrieval tree
[計] 檢索樹
?? 詞語組成解析
retrieval
[ri'tri:v?l]
n. 收回，挽回;檢索;
tree
[tri]
n. 樹;木料;樹狀圖;宗譜;
vt. 把…趕上樹;使處于困境;把鞋型插入（鞋內）;
??? 情景例句
I know it's Malcolm Stewart.
我就知道是Malcolm Stewart。
He operates the crane.
他在操縱起重機。
That sounds interesting. That was a hundred years ago, wasn't it?
聽起來很有意思。那是一百年前的事了，不是嗎？