事后，我一直在想：有自信不一定能成功。
After that, I have been thinking: It is self-confidence is not necessarily successful.
努力，不一定能成功；不努力，绝不可能成功。
Work hard, can not succeed; Don't work hard, never likely to be successful.
他在努力但是不一定能成功，不一定能给我幸福。
He's trying to but can not succeed, can not give me happiness.
我想我们不一定能成功，但是不管怎样还是试试吧。
我想我们不一定能成功，但是不管怎样还是试试吧。
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