It's difficult to understand his explanation.

It's difficult to understand his explanation.

His explanation was impossible to understand.

Understanding crystal habit is important in understanding the characteristics of minerals.

Natural language understanding is an important field of artificial intelligence.

Understanding the characteristics of that plant is very important for growing it.

This area is known for producing a variety of minerals.

Please put the book on the shelf above.

In addition, he can play the piano.

Health is very important.