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The fixation of the stapes may progress rapidly during pregnancy. 在懷孕期鐙骨固定可能迅速發(fā)展。
But the stapes would not take on its familiar role as a component of the terrestrially adapted tympanic ear for millions of years. 不過，還要數(shù)百萬年后，鐙骨才會在適合陸生的鼓膜耳朵中，擔(dān)任我們所熟悉的任務(wù)。