regular arc

例句：

1. 1. The clock is set to thehour of 8:00 everyday.
   这个钟每天设定在8点。
2. 2.The schedule for the meeting is regular.
   会议的日程安排是规律的。
3. 3. The gardenis maintained regularly by the caretaker.
   园丁定期维护花园。