Poset
n. 偏序集
??? 情景例句
Good-bye.
再見。
Music washes away from the soul the dust of everyday life.
音樂可洗去靈魂中日常生活所沾染的污垢。
An advertisement which begins with the magic word FREE can rarely go wrong.
凡是用“免費”這個神奇的詞開頭的廣告很少會失敗的。