s. physically secure or dependable
s. (of persons) worthy of trust or confidence
s. infallible or unfailing
s. certain not to fail
a. 确信, 必然的, 必定的
adv. 当然, 确实地, 无疑地
1. I am sure that I left my keys on the table.
我确定我把钥匙放在桌子上了。
2. Are you sure you want to go to the party tonight?
你确定今晚想去派对吗？
3. She is sure that she can finish her homework on time.
她确定她能按时完成作业。