certain的副詞是什么意思

　　'Certainly not,' he replied emphatically.

　　“當(dāng)然不。”他斷然回答道。

　　Moby certainly has a fine ear for a tune.

　　莫比對(duì)音調(diào)的分辨能力一定很強(qiáng)。

　　He certainly was not politically inactive.

　　他在政治上當(dāng)然不是無(wú)所作為。