以此来提醒你每隔30分钟就离开电脑或书本，向远处看30秒钟。

Use this as a reminder to look up and away from your computer or book to some distant point for 30 seconds.

youdao

以此来提醒你每隔30分钟就离开电脑或书本，向远处看30秒钟。

Use this as a reminder to look up and away from your computer or book to some distant point for 30 seconds.

youdao