But I know for sure that she was my mother's best friend.
可是我知道了，她就是我妈妈的好朋友。
Don't know for sure, but yes, I think there is some.
还不能确定，但答案是肯定的，我认为有些产品会是这样的。
Sure, no one else may notice, but I know, and that’s good enough for me!
他们很低调，没有人会注意到他们的作用，但是我自己知道，这就足够了。
This must be so hard for you. I'm not sure what to say but I want you to know I'm here for you.
我知道你肯定非常难受。我不知道该说些什么，你只要知道我一直都在你身边。
Not yet. But I know that for sure. I didn't finish the paper.
还没有。但是我很肯定。我没有写完那张试卷。
I think I will remain one more year, but I do not know for sure yet.
我想我可以至少呆一年，但是我还不确定。
I want to know everything, but realize that nothing can ever be known for sure.
我想知道的一切，但实现没有什么可以被称为肯定。
But I know, I know, I know for sure.
但是我知道，我知道，我能确信。
Here is an alternative, "I'm not sure this task is the first one I would pick, but I know the challenge will be good for me."
这有个选择，“我不确定这个任务是我们首先做的任务，但是我知道这个机会一定对我有好处。”
I'm not sure what to say but I want you to know I'm here for you.
我不知道该说些什么，你只要知道我一直都在你身边。
I suppose so, but I don't know for sure.
我想大概是吧，我不大清楚。
I suppose so, but I don't know for sure.
我想大概是吧，我不大清楚。
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