While aging is inevitable, scientists are finding out that certain changes in brain function may not be.
尽管衰老是不可避免的，科学家们却发现大脑功能的某些变化或许并非不可避免。
No one knew, but it was certain and inevitable.
没有人知道，但那是必然的，无可避免的。
The operating mode of the unsteady flow in the dynamic system of the pipeline is inevitable, and has the character of the strong transitory in certain cases.
管道动力系统中非定常流动工况是不可避免的，并且在一定条件下，具有强瞬变特性。
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