In set theory, the symmetric difference indicates the difference between two sets.

She has trypophobia, and feels discomfort when she sees things with many holes like beehives or corals.

He solved the problem in a scientific way.

This reaction occurs through a chemical process.

He is good at tactical thinking.

He exercises every day and leads a healthy life.

Fundamental knowledge of mathematics is necessary to solve advanced problems.

This park was completely artificially made.

She is looking for an ideal partner.

He has expert knowledge.