This organism has a very complex anlage in the early stages of development.

This problem is very complex and cannot be solved easily.

I am majoring in developmental biology at university.

There were many difficulties in the initial period of this project.

I was amazed at his extraordinary talent.

Please press this button in case of emergency.

It is a very beautiful view.

It is difficult to predict the occurrence of earthquakes.

When the earthquake occurred, we evacuated immediately.

We had a picnic in the field.