My biological clock is disrupted, and I've been having sleepless nights.

I went to the watch store to buy a new wristwatch.

He is the best clockmaker in town.

He likes to smoke cigars.

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.

In order to find the empirical formula of this compound, you must first calculate the ratio of elements.

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

It's difficult to decipher this chemical equation.