He is doing special exercises to strengthen his cervical muscles.

He trains his deltoid muscles at the gym every day.

He has strong masseters, so he can easily bite through hard food.

If your muscles of mastication are strong, you can chew food more efficiently.

In her anger, she decided to perform the ushi no toki mairi.

He is interested in diachronic linguistics studies.

He is interested in synchronic linguistics.

My class starts at eleven o'clock.

I eat lunch at twelve o'clock.

He has been committing misdeeds for many years, but finally the time for repayment has come.