What sort of something though can cause an increased expression of degradative enzymes?

那么有什么东西会导致降解酶的表达增加呢？

But while there are far fewer degradative forces at play in the Black Sea's depths, anaerobic bacteria do gradually weaken organic materials.

虽然在黑海深处很少有会造成降解的因素存在，厌氧细菌确实会渐渐削弱有机材料。

When something causes an increased expression of degradative enzymes, then the balance tips toward a net loss of cartilage, via loss of proteoglycans and collagen.

当某些因素导致分解酶表达增加时，蛋白聚糖和胶原纤维的损失使得平衡倾向于软骨净损失。

In healthy people, chondrocytes maintain a delicate balance between breaking down old cartilage—called catabolic activity, and producing new cartilage—called anabolic activity, through the use of both degradative enzymes and synthetic enzymes.

在健康的机体内，软骨细胞在分解老化的软骨（分解作用）和产生新的软骨（合成作用）之间通过分解酶和合成酶来保持精细平衡。

Many of the 65 ships that were recently uncovered have retained their original forms. But while there are far fewer degradative forces at play in the Black Sea's depths, anaerobic bacteria do gradually weaken organic materials.

最近发现的 65 艘船中有许多保留了它们的原始形式。但是，虽然黑海深处的降解力要少得多，但厌氧细菌确实会逐渐削弱有机物质。