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

It is reported that North Korea has conducted another nuclear bomb test.

He is looking for a proving ground to test his new theory.

He conducted a thought experiment to solve a problem in physics.

I found an old box in the storeroom.

This speech synthesizer generates very high-quality voices.

He likes to take a walk in the park at dusk.

She felt the pathos of things when she saw the cherry blossoms falling.

What is this object?

Zoo staff must clean up the animals' excrement every day.