My signature is required on this contract.

He is traveling around the world in search of the elixir of life.

His words reminded me of the proverb 'good advice may be uncomfortable to hear.'

The external urethral sphincter is an important muscle for controlling the excretion of urine.

This blade is very sharp.

Is the kanji 署 used in a name?

He is an expert in ethology.

We went to the zoo with our family on the weekend.

He is an expert in ethology, and his research is highly regarded worldwide.