He made various efforts to solve the problem.

A windstorm suddenly hit our camp.

Surface meteorology is a part of meteorology that studies the interaction between the surface and the atmosphere.

The Yi were an ancient tribe in eastern China.

Understanding the concept of 'Ha-line conversion sounds' is important in learning Japanese.

He said 'friend' as a noun ending for me.

He is always facing difficulties, just like the proverb 'clouds over the moon, wind in the flowers'.

The continental slope is a part of the seafloor topography, connecting the continental shelf and the deep sea floor.

Yamatokoku is one of the ancient states of Japan, also written as Yamataikoku.

She put a ring on her ring finger.