I could see the beautiful sea from the porthole.

Recently, his popularity has been increasing.

We went down the river by boat.

He remained silent and didn't say anything.

The ship has sunk.

I always enjoy birdwatching in the park on weekends.

In the ecosystem of this area, 'inquilinism', where certain species parasitize the nests of other species, is common.

Learning about the history of Seiban is important for understanding our past.

Gender discrimination is one of the social issues that needs to be resolved.

Xikang is a historical region name in China.