这些树叶在泥浆中埋藏了数千年，最终变成了化石。

The leaves were buried in mud for thousands of years and eventually ___fossilized.

公司的管理理念已经僵化,无法适应市场变化。

The company's management ideas have ___fossilized, unable to adapt to market changes.

英语中'whom'这个词是语法化石化的一个例子。

The word 'whom' in English is an example of a ___fossilized grammatical form.