I'm not really sure about that.

我不太确定这个。

I have no clue.

我一点头绪都没有。

Beats me.

我完全不知道。

I'm not sure, to be honest.

老实说,我不太确定。

I haven't figured it out yet.

我还没搞明白。

No idea, sorry.

不知道,抱歉。

I'm not entirely certain.

我不是完全确定。

It's hard to say.

这很难说。

I'm still thinking about it.

我还在想这个。

I'm kind of on the fence.

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