a.
abbr. 形容词(adjective)
例句
They had a butler, a cook, and a maid.
他们有一位管家、一位厨师和一位女仆。
《柯林斯英汉双解大词典》
He's a scoundrel! A cad!
他是个恶棍!一个卑鄙的无赖!
A vandal with a chainsaw cut down a tree.
一个蓄意破坏公物者用链锯锯倒了一棵树。