The functioning of all body systems and organs, including the brain, tends to deteriorate with age.

因为，包括大脑在内的人体的所有系统和器官都会随着年龄的增长而退化。

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The results show that post-exposure tensile properties deteriorate with the increase of exposure temperature.

结果表明，随热暴露温度升高，合金性能恶化。

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Another point to consider: paper photos can easily be destroyed in a fire, flood, or other disaster (or slowly deteriorate with age).

还有一点要考虑的，即纸质照片很容易就能在一场火灾、洪水或其他什么灾难中毁掉(或是随着岁月慢慢老化)。

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Bonus benefit: lunges help strengthen your flexibility and balance, two areas that deteriorate with age.

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For men, there are also risks in waiting until they are older to father children as semen counts deteriorate with age, they say.

BBC: NEWS | Health | Delaying babies 'defies nature'

While I've always wondered about the relationships Lieberman has had with some of his less compromising anti-war Democratic colleagues, I would assume those relationships could deteriorate further with his backing of McCain.

NPR: Thompson Accelerates Pitch to Iowa Voters