但我不确定哪种健身器材最有效。

But I'm not sure which of the gym equipment would best help.

youdao

我们下周可能会举行毕业典礼，但我不确定。

We might have a graduation ceremony next week, but I'm not sure.

youdao

我找不到我的钱包了。昨天可能我把它忘在超市了，但我不确定。

I can't find my purse. I could have left it in the supermarket yesterday, but I'm not sure.

youdao

Now I don't know, I may be different than other people, but I think organic chemistry is really interesting.

但我不确定,也许我和他人不太一样呢,我认为有机化学很有趣

耶鲁公开课 - 金融市场课程节选

I think they're about 17 and 5 or something like that or somewhere near that, not sure but

他们大概是17胜5负这样子，或者差不多，我不确定但

大学篮球的人气 - SpeakingMax英语口语达人

Yes, that's probably true as a general observation, whether it comes through clearly on these two-- this comparison-- I'm not quite so sure, but there--I wouldn't say there's a great deal of detail in the first one.

是,可能从一般角度观察是对的,不管是否是通过,这两者的对比得出的结论,我也不太确定,但我不会说,第一首里有大量的细节处理

耶鲁公开课 - 聆听音乐课程节选