He is interested in astronomy, especially in studying Draco.

He was immersed in music.

My father is spreading phosphate fertiliser in the field.

He is in his unlucky year, so he needs to be particularly careful.

My signature is required on this contract.

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

He needs long-term drug therapy.

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.