The circumpolar star is always visible in the north.

This old radio uses a pentode.

The Arctic Tern, also known as 極鯵刺, can be seen in the Arctic region.

The arctic tern is known for its long-distance flights.

He is a master of Bajiquan.

I am interested in the culture of China.

He is good at reading Chinese text.

I am busy with work during the day.

I work during the daytime.

He is researching the functions of the midbrain.