I do not know for certain what the future holds but I am confident that with hard work, a little bit of luck and a supportive network of friends, I can be as successful as I want to be.
我不确知未来，但我相信通过艰苦的工作加上一点点的运气和朋友们的帮助，我一定能够心想事成！
I do not know, for certain, what they mean.
我不知道他们所说的确切含义。
From a certain perspective that I really do not know where is the future, but differs from the previous, but different only for time.
从某一角度说我真的不知道未来在哪里，但又和以前不同，但不同的也只是时间而已。
And the same goes for you. If you do not understand certain American behavior or you want to know more about them, do not hesitate to ask them questions about themselves.
换成你也一样，如果你不理解某些美国人的行为或你想知道他们更多的东西，就毫不犹豫地去问他们。
For example, if you want to ensure that callers have permission to read a certain file, but you do not know the name of that file until run time, use an imperative demand.
例如，如果要确保调用方拥有读取某个文件的权限，但在运行时之前不知道要读取的文件的名称，此时请使用强制性要求。
For example, if you want to ensure that callers have permission to read a certain file, but you do not know the name of that file until run time, use an imperative demand.
例如，如果要确保调用方拥有读取某个文件的权限，但在运行时之前不知道要读取的文件的名称，此时请使用强制性要求。
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