该校正在考虑是否分发 iPhone，但不确定是否有必要。该校指出，去年该校网络上注册的 iPhone 超过700部。

It is considering whether to issue iPhones but not sure it's necessary, noting that more than 700 iPhones were registered on the university's network last year.

youdao

我知道另一个人的存在，但不确定到底是谁。

I am aware of another presence, but whose I cannot rightly determine.

youdao

接近但不确定。

Approached but never identified.

youdao

The first is, that while God's promise is sure, the manner and the timing of its fulfillment is quite unpredictable.

首先是，上帝的承诺是确定无疑的，但实现的方法和时机却都是不可知的。

耶鲁公开课 - 旧约导论课程节选

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

There may be uncertainties of that nature but certainly not the uncertainties of early humans.

也许还有其他的不确定因素,但这绝不等同于早期人类的不确定因素

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选