他的固执想法就像块化石，拒绝任何改变。

His stubborn idea has become an ___ossification, refusing any change.

这个旧程序使用OSS来处理音频输入和输出。

This legacy program uses ___OSS to handle audio input and output.

多年的传统让他的观念变得僵化。

Years of tradition made his beliefs ___ossified.