中央供热系统一开始工作，年久老化的木板就嘎吱作响。

The central heating was coming on and the ancient wooden boards creaked.

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然而，骨髓是个例外，因为即使在成年人体内，骨髓细胞也在不断分裂，以取代老化的血细胞。

Bone marrow is an exception to this rule, however, since even in adults, bone marrow cells continually divide to replace old blood cells.

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宝洁在测试一种抗日晒引起的老化的护肤霜。

P&G has been testing a cream that counters the effects of ageing from sun exposure.

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And even once we acquire those skillful movements the circuits that produce those movements need to be continually recalibrated as the body changes, as it grows and then ages we need to make those recalibrations or our movements will again become clumsy like those of a child.

即使你掌握了这些复杂的动作，产生这些动作的神经回路还会根据你的体态不断作出调整,随着这些回路的老化，你要做的这些调整，或者说动作又会像孩提时那样,变得笨拙起来。

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you know, everything's old. So, yeah.

所有的一切都老化了。的确如此。

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It might bend and bow, that is it's not the forces of nature like the movement of the river that's knocking the bridge down, but it's just the failure of these materials over time, that they don't last as long as they might.

这桥可能会折断,不一定是洪水这样的自然灾害,导致了桥梁的坍塌,可能只是因为建桥的材料老化,这种材料没有那么持久耐用

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