I conducted an interview in a question-and-answer format.

We should use more renewable energy.

We are using LED bulbs for energy saving.

One minute is sixty seconds.

He ran 100 meters in 10 seconds.

She was a secret kunoichi (female ninja).

He threw a handful of sand into the sea.

"Once in a lifetime" means to cherish the encounter that happens only once in one's lifetime.

He missed a once-in-a-lifetime opportunity.

He was focused on his work all day long.