This painting is truly a rarity.

She bought a new hairpin.

He proceeded with the conversation in a refined and cultured manner.

Heavy hydrogen is one of the isotopes of hydrogen.

Please calculate the value of the cotangent, which is one of the trigonometric functions.

It's difficult to understand what's in his heart.

The epicenter is located about 100 kilometers southeast of Tokyo.

This brass vase is very beautiful.

She chose to have an abortion.

Let's look at this truth table and understand the result of the logical expression.