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

This company demands uniformity in all projects.

This design has uniformity in color.

This vitamin is water-soluble, so it easily dissolves in water.

This cold is highly contagious, so please be careful with prevention.

Database transactions need to ensure their atomicity.

Flexibility is necessary for success.

This math problem is based on the principle of additivity.

This problem can be solved using the principle of linearity.

It is important to understand the importance of health.