His explanation was clear and easy to understand.

His explanation was clear and easy to understand.

His speech was full of similes, captivating the audience.

He is writing a thesis on the octovocalic theory.

The heliocentric theory is the idea that the sun, not the earth, is the center of the universe.

He believes in the geocentric theory.

He is writing a thesis on abiogenesis.

He is writing a thesis on monotheism.

In Hachijō Island, it's becoming a problem that the termite, 'shōrime', is eating the wood of houses.

An oriental turtle dove flew into the garden.