But if the decay continues and breaks through the surface of the enamel, the damage is permanent.
但是如果龋坏继续进行穿过表面的牙釉质，将会形成永久性损害。
We all know that too much sugar can cause not only obesity and diabetes but also tooth decay - this destroys the hard surface of your teeth and exposes more sensitive parts.
众所周知，糖摄取量过高会造成肥胖、糖尿病和牙齿问题——牙齿表面不再坚固，牵动牙齿内部神经。
Wood decay fungi, such as Trichoderma sp., after they attach themselves to the surface, secrete a whole family of cellulolytic enzymes.
木材腐朽真菌，如木霉，在它们附着在表面后，可分泌全部种类的纤维素酶。
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