The fixation of the stapes may progress rapidly during pregnancy. 在怀孕期镫骨固定可能迅速发展。
But the stapes would not take on its familiar role as a component of the terrestrially adapted tympanic ear for millions of years. 不过，还要数百万年后，镫骨才会在适合陆生的鼓膜耳朵中，担任我们所熟悉的任务。
