Specific enzymes called collagenases can digest collagen, but only certain microbes produce it.

一种叫做胶原酶的特殊酶可以消化胶原蛋白，但只有特定的微生物才能产生胶原蛋白。

Second, even if a microbe produces collagenase and other proteases, enzymes that break down proteins, they CAN'T reach the collagen protein due to its interaction with calcium.

第二，即使微生物能产生胶原酶和其他蛋白酶，这些酶可以分解蛋白质，但由于胶原蛋白与钙的相互作用，它们无法到达胶原蛋白。