ad.

1. 確實，無疑，一定
   She surely seems happy.

   她看來肯定很快活。

2. 穩當地
   He walked slowly but surely.

   他走得很慢，但卻很穩當。

3. 想必
   Surely you don't believe that!

   你想必不會相信那種事吧！

4. 【美】【口】當然
   --"Are you going with us?" --"Surely."

   —"你和我們一起去嗎？" —"當然啦！"

adv.

1. it must be true that (used for emphasis).
   ▸certainly.
   ▸ [as exclam.] N. Amer. informal of course.
2. with assurance.