The Chernobyl accident is considered the worst nuclear disaster in world history.

He began to pay attention to that problem.

He likes to imagine the life of subterranean dwellers.

He is working with bloodshot eyes.

He continued to work with bloodshot eyes.

The thunder roared, and the sound of the thunder echoed.

He always acts with a spirit of sincerity and consideration.

Topography is a field of study that researches terrain and geographical features.

He is explaining the fact of the expulsion of the Japanese in detail in that history book.

They started a movement to expel the Japanese.