okresy 英語で:

Tom's school day is divided into six periods.

A business cycle is a recurring succession of periods of prosperity and periods of depression.

After dark clouds, you get periods of refreshing clear weather.

periods of work experience

In the sphere of thought, absurdity and perversity remain the masters of the world, and their dominion is suspended only for brief periods.

The plays of Shakespeare fall into four periods.

I have very heavy periods.

The postwar has experienced several long periods of continuous strong prosperity, among which are the Jinmu Boom and the Iwato boom.