Groundwater pollution has become a serious environmental problem.

I saw various aquatic creatures at the aquarium.

The Papua Bush Turkey is a very rare bird.

The Papua fire-eating bird, with its unique appearance, is a bird you won't forget once you see it.

He crossed many mountains and rivers to meet her.

There must be a reason why he is acting suspiciously. It's like the saying, 'Where there's smoke, there's fire.'

Please remember this old proverb, 'The friendship of a gentleman is insipid as water.'

I work at my company from Monday to Sunday.

Gessho Kassuimokukinkin is a military song in Japan, and its lyrics depict the rigorous training of soldiers.