我对这不确定。
'I'm not sure about it,' he said weakly.
“这我说不准。”他支吾说。
Traditional dance teachers did not welcome it because they thought it was not even a real dance and were quite sure about its demise but Swing has proved them wrong; it continues to be one of the world's most fun dances.
传统舞蹈老师不欢迎它，因为他们认为它甚至不是一个真正的舞蹈，并非常确定它会消亡，但摇摆舞证明他们错了；它仍然是世界上最有趣的舞蹈之一。
你对这有把握吗？ ？
对于这件事我确实有把握。
我真的不敢确定的。
What could you say for sure about it?
你们有什么可以确定的吗？
我不肯定。
B: Sorry, I'm not really sure about it.
对不起，我不能肯定。
你对此确信吗？
I think you are not quite sure about it.
我认为，你们对这一点并不能完全肯定。
I'm not sure about it. I hope the company will.
我不太清楚。希望公司会给出钱。
I'm not sure about it. I have to check my schedule.
我不肯定。我得检查一下我的日程安排。
Do you feel sure about it? Do you feel sure about it?
你能对这有把握吗？你能对这有把握吗？
I think the answer is right, but I'm not sure about it.
我想这答案是对的，但是我没有把握。
I think the answer is right but I'm not so sure about it.
我想这答案是对的，但我没有把握。
I am not sure about it. Can I inform you later this week?
这件事我不确定，我可以本周晚一点通知你吗？
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 might go to the concert tonight, but I am not sure about it.
我可能今晚要去看音乐会，但还不确定。(表示对现在不太肯定的推测)。
I think the answer is right, but I'm not absolutely sure about it.
我认为这答案是对的但我没有绝对的把握。
Who this book isn’t for: anyone who doesn’t plan to test (and are sure about it).
本书并不是为以下人群所写：没有计划，或者不确定是否要进行可用性测试的人。
In fact, I heard something about you at school, but I am not very sure about it.
事实上，我今天在学校听到了一点有关你的事情，但是我并不是很清楚。
If you are not sure about it, you must not decide to accept the date until you have considered it carefully.
如果你还不确定是否目前要考虑这种问题，那么请你先考虑清楚再决定是否接受约会安排。
If you are not sure about it, you must not decide to accept the date until you have considered it carefully.
如果你还不确定是否目前要考虑这种问题，那么请你先考虑清楚再决定是否接受约会安排。
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