He is spending a lot of time on experimental research.

That plan is too impractical, it's difficult to implement.

I'm troubled by his unproductive attitude.

He was affected by secondary effects.

World War I was a large-scale war that lasted from 1914 to 1918.

World War II lasted from 1939 to 1945.

Let's pray that World War III does not occur.

In behavioral sciences, the use of metatools plays a crucial role.

He is writing a thesis on dialectical materialism.

It is important to distance yourself from antisocial forces.