He is researching the effects of underground nuclear tests.

He is obsessed with the world of social media.

Groundwater pollution has become a serious environmental problem.

My house is near the station.

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

He is living a life of shabby clothes and plain food.

We are planning to go to the aquarium this weekend.

I found a brown-headed thrush in the park.

In Greek mythology, Aether was the god of the sky.

Sometimes it's difficult to distinguish between good and evil.