The ecosystem of this lake is very fragile.

In physics, the inertial frame of reference is a very important concept.

This system is very complex.

The Transmission Control Protocol is an important element for ensuring the reliability of data communication.

The police found a drowned corpse in the river.

The structure of this building is very sturdy.

She underwent surgery on her lens.

He is learning calligraphy in regular script-style.

This textbook-style font is easy to read, isn't it?

Health and physical education class is my favorite time.