certainly中文翻译是当然; 肯定; 无疑; 确定; 行;
1、ADV-GRADED 当然;肯定 You use certainly to emphasize what you are saying when you are making a statement.
The public is certainly getting tired of hearing about it...关于此事,公众当然已经听腻了。
2、ADV (表示同意)当然,行,没问题 You use certainly when you are agreeing with what someone has said.
'In any case you remained friends.' — 'Certainly.'...“无论如何,你们都是好朋友吧。”——“那当然。”
3、ADV as reply 当然不 You say certainly not when you want to say 'no' in a strong way.
'Perhaps it would be better if I withdrew altogether.' — 'Certainly not!'“也许,我完全退出更好吧。”——“当然不是!”