Sure.

常见例句

I think so; in fact, I am quite sure.
我想如此，事实上我非常确信。
He likes to be sure of his bodily comforts.
他注重身体上的舒适。
I'm going to make sure if I'm going to Macao.
我要拿定主意我是否去澳门。
Sure, his dad is a lush, but he's always the life of the party.
没错，他父亲是个酒鬼，但他永远是宴会的灵魂人物。
It is no fun betting on a sure thing.
对必然要发生的事打赌是毫无意义的。
I'm not sure whether to resign or stay on.
我拿不准主意是辞职还是留任。