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。
We are certain to enter into relationship with people, as humans are social beings (organisms/animals/creatures??) with the inevitable fate of connecting with others.
你一定会与某些人达成关系，人类是社会性的动物，与他人必有关系是你无法回避的命运。
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