Radioactive elements are produced in nature and scientific experiments.

His way of speaking is monotone, and I can't feel any emotion at all.

I have my graduation ceremony tomorrow.

Next year, my younger brother will have his coming-of-age ceremony.

The Wade-Giles romanization is often used to express the pronunciation of Chinese.

It's difficult to decipher this chemical equation.

We attended the cornerstone laying ceremony of the new building.

He used a familiar spirit to defeat the enemy.

We won the top prize at the award ceremony.

We attended our grandfather's funeral yesterday.