For once, I decided to take a walk at sunset.

Once and for all, you will learn to do things on your own.

Each student, in turn, must answer the teacher's questions.

The barrel vault is a very common architectural element in Romanesque churches.

The sail vault of the church is an extraordinary example of Gothic architecture.

The groin vault is a typical architectural element of the Gothic style.

We need to solve this problem once and for all.

I will go on vacation in the mountains some time or another.

The voltage of the battery is too low.

This solar panel uses voltaic energy to generate electricity.