Artwork is so delicate that quick changes in humidity, heat and light levels can rapidly age it.

艺术品很脆弱，湿度、温度和亮度的快速变化都会使其迅速老化。

These experts fear if these causes are not solved, an age change could do more harm than good.

这些专家担心，如果这些原因得不到解决，年龄变化可能弊大于利。

How an age in years corresponds to a species' biological age changed over time, they found.

他们发现，以年为单位的年龄对应于一个物种的生物学年龄是如何随时间变化的。