这男孩当时也许知道真相，但我不很确定。

The boy might have known the truth, but I am not quite sure.

youdao

两个半月过去了，施瓦茨依然不很确定问题出在哪里。

Two and a half months later, Mr. Schwartz still isn't quite sure.

youdao

我不很确定，但我想我得到了下面也在追踪这些东西的报告。

I'm not sure, but I think we got a report from the Underside that they're tracking objects as well.

youdao

We can't know exactly and this is one of the wonderfully unsettling things about this stanza we can't know exactly to whom Milton is addressing this stanza.

我们不能确切的知道,而这也是这一段很奇妙的不确定性所在,我们不能确切的知道弥尔顿这一段是在对谁讲话。

耶鲁公开课 - 弥尔顿课程节选

I don't know about that. I am not so sure." But then, we realized that like when we walk out that door, it's the whole world again. So you get sucked up by your group, by your sort of identity.

我不知道，不是很确定，然后呢，我们就意识到走出那个大门，又是一个完整的世界，所以你就会,被你的团体，你的身份所束缚。

普林斯顿公开课 - 人性课程节选

You always want to check your signs at the and because it's so easy to get the sign wrong, and I was hoping that it was right here because I wasn't sure, but it turned out to be right.

我们完成计算时，一定要记得检查符号,因为很容易弄错符号，刚才我就不太确定,是否弄错了符号，检查发现没有问题。

麻省理工公开课 - 热力学与动力学课程节选