我不知道公司有没有空缺，不过我会打听打听。

I don't know of any vacancies in the company but I'll ask around.

《牛津词典》

我不知道。我没有参与那场争论。

I don't know. I wasn't in on that particular argument.

《柯林斯英汉双解大词典》

“我没有在电话里告诉你，”她说。“我不知道谁会在听。”

"I didn't tell you over the phone," she said. "I didn't know who might be listening."

《柯林斯英汉双解大词典》

I don't know how many kids, generation after generation, get in trouble because they do not remember the following fact.

我不知道有多少孩子,一代又一代,因为没有记住下面的内容而遇到困难

耶鲁公开课 - 基础物理课程节选

So they've got these superhighways which is, I don't know if you've seen them, they are marked on in blue.

所以，他们修了这些高速路，我不知道你见过没有，他们被标成蓝色了。

伦敦的蓝色自行车 - SpeakingMax英语口语达人

But they don't I don't know, it's just -there isn't enough initiative in the world, not many people do it.

但是他们没有这样做,我不知道,也许只是,主动性不够,没什么人这样做

耶鲁公开课 - 金融市场课程节选