A large, on-screen circle that expanded and contracted illustrated when I should inhale and exhale as I held positions.

屏幕上一个大大的圆圈通过扩张和收缩告诉我在保持姿势的同时该如何控制气息。

youdao

On one part of the screen, a symbol would appear, and on the other side two symbols inside a circle were shown.

在屏幕的一侧会出现一个符号，而在另一侧，会显示圆圈内的两个符号。

youdao

The subjects saw a circle—large, small, or in between—on a computer screen.

研究对象会在电脑屏幕上看到一个或大或小或居间的圈。

youdao

Generally, these manufacturer skins exist with the claimed goal of enhancing the platform's stock functionality, but we actually found a case on the Epic where the opposite is true: the phone's lock screen consists of a circle in the center of the screen that you drag up to unlock... and that's it.

ENGADGET: Epic 4G review

The main menu screen features a circle of six Roald characters - all of which move while the site "waits" for you to select an option.

BBC: Roald Dahl web worth it

There's some calibration involved when moving from person to person, chasing a circle around the screen with your eyes.

ENGADGET: Haier's Eye-Control TV set, we go eyeballs on (video) HD