int.(书写形式，表示有疑虑或犹豫时发出的声音)呣，嗯，唔，哼

Hmm, I'm not sure about that.
嗯，我对此不太确定。
Hmm, let me think about it for a moment.
嗯，让我想一想。
Hmm, there seems to be a problem here.
嗯，这里好像有个问题。
Hmm, the food doesn't taste quite right.
嗯，这食物味道不太对。
Hmm, I wonder where she could have gone.
嗯，我在想她可能去哪儿了。
Hmm, that's an interesting idea.
嗯，那是一个有趣的想法。
Hmm, the weather looks like it might change soon.
嗯，看起来天气可能很快会变。
Hmm, I can't quite recall his name.
嗯，我记不清他的名字了。
Hmm, this book isn't as good as I thought it would be.
嗯，这本书没有我想象中那么好。
Hmm, I need to consider the consequences before making a decision.
嗯，我需要在做决定前考虑一下后果。