"Certainly" 译为 "当然"，意思是 "definitely"，"without a doubt" 或 "absolutely".
来源："Certainly" 源自于拉丁语的 "certus"，意思是 "sure" 或 "fixed".
例句：
Will you be able to come to the meeting? - Certainly, I will be there.
你能参加会议吗？- 当然，我会去的。
Can I get a refund for this product? - Certainly, let me process that for you.
我能退款吗？- 当然，让我帮您处理。
Would you pke to go out for dinner tonight? - Certainly, I'd love to.
今晚你想出去吃晚饭吗？- 当然，我很愿意。