The urachus is a structure that exists during the fetal period, connecting the bladder and the navel.

She was diagnosed with salpingitis.

He solved the problem in a scientific way.

This reaction occurs through a chemical process.

He is good at tactical thinking.

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.

He is troubled by chronic headaches.