For some reason, I can't convert this sentence.

He understands the importance of learning.

He is majoring in psychology.

Gaku is my best friend.

He has a deep interest in archaeology.

He is good at geometry.

Differential geometry is a field of mathematics that studies geometric objects such as curves and surfaces using differential and integral calculus.

Understanding geometric series is important in learning the basics of advanced mathematics.

I am reading Euclid's Elements and learning the basics of Euclidean geometry.

Please calculate the geometric mean of this dataset.