Them is something about all this that I do not understand: but if ever we need to know it, you may be sure that we shall.
在这一切里，有些东西我不理解，但如果我们确实需要弄明白的话，你不妨深信不疑，我们一定会弄明白的。
You should not be bitter about not getting that job. I am sure you will find a better one soon.
不要为没有得到那份工作而感到苦恼。我相信你很快就会找到一份更好的工作的。
我不敢肯定是这辆车。
I am not sure what you say about a statement like that.
我不知道是什么，你说约一份声明中这样的。
I think that it was years ago, but I'm not sure about it.
我想那是两年前的事，不过我不能肯定。
I used to be indecisive, now I'm not sure about that anymore.
我曾经犹豫不决，现在我却完全不确定了。
I used to be indecisive, now I'm not sure about that anymore.
我曾经犹豫不决，现在我却完全不确定了。
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