必要的必然的
双语例句原声例句
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执行这项工作所需的信息虽然复杂，但能得到，而且提前的规划通常是不必要的挫折和必然的成功之间的分水岭。
The information you need to do the job, however complex, is available, and up front planning is often the difference between unnecessary frustration and ceratin success.
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有必要的时候你才会说，因为你知道：当他们想听的时候，他们必然会听。
You speak when it’s time to speak and know that those who need to hear will hear when they’re ready.
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在任何一个国家无所寄托的年轻男性必然带来麻烦。在亚洲国家，婚姻和子女是得到社会认可的必要条件，单身男性几乎像不法分子。
In any country rootless young males spell trouble; in Asian societies, where marriage and children are the recognised routes into society, single men are almost like outlaws.
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But in fact, logically speaking at least, variability, although it's a requirement for unpredictability, doesn't guarantee unpredictability.
但实际上，至少在逻辑上讲，可变性虽然是不可预见性的必要条件，但是不可预见性却不是必然。
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