思想僵铁的英文：
fossilized concept

fossilized是什么意思：
v. [fossilize] 的过去式和过去分词形式；使陈腐，变成化石

My father is an old fossil.
我老爸是个老顽固。

Needs change while policies fossilize.
需要发生改变，但是政策僵化不变。

classification and nomenclature of spore and pollen fossil
孢粉化石的分类和命名

At this distance of time it is difficult to date the fossil.
时间隔得这么久了，很难确定这化石的年代。

The dating of the newfound fossils is controversial, however.
然而关于新发现化石的测定年代颇存争议。

concept是什么意思：
n. 概念，观念，思想

distribution of concept
概念的周延

It was an idyllic conception.
这是一种牧歌式的构想。

The conception of the United Nations was in 1945.
联合国创始于一九四五年。

The conception of the picture is undeveloped.
这幅画的构思不成熟。

In the teenage, the concept of happiness changes.
到了青少年时期，幸福观变了。