Please add a little vinegar to this salad.

His role is to fulfill his responsibilities as a leader.

Organic solvents play an important role in chemical reactions.

What is the focal point of this discussion?

He was consumed with worry about his job.

He was worrying himself about the results of the exam.

If the balance of the triple burner is disrupted, you may feel unwell.

His nature is very kind.

Detailed information is needed to understand the nature of that project.

I was moved by his sincerity.