1 without doubt 无疑: This will surely cause problems. 这一定会带来问题。

2 used for expressing surprise at sb else's opinions, plans, actions, etc （表示惊讶）: Surely you're not going to walk home in this rain? 下这么大雨，你怎么走路回家呀？‘Meena's looking for another job.’ ‘Surely not.’ “米纳正在找别的工作。”“不会吧。”

3 (US 美) (informal 非正式) yes; of course 可以；当然