r definitely or positively (`sure' is sometimes used informally for `surely')
adv. 确定地
1. I will certainly help you with your homework.
我一定会帮助你完成作业。
2. She will certainly come to the party tonight.
她今晚一定会来参加聚会。
3. This restaurant certainly serves the best pizza in town.
这家餐厅一定是镇上最好的比萨店。