n.化石化；固定化；陈腐
He found a piece of fossil of an ancient bird. 他发现一块古代鸟类的化石。
This fossil may be over 2 million years old. 这化石可能超过二百万年了。
Can you date the fossil exactly? 你能确定这化石的确切年代吗?
Isn't Professor Bell an old fossil? 贝尔教授真是个老顽固。
A microscopic fossil, as of a pollen grain or unicellular organism. 微体化石一种微小的化石，如花粉粒或单细胞有机体的化石
If we squander our fossil fuels, we threaten civilization. 如果我们浪费矿物燃料，我们就威胁文明。
