remain on guard的意思|示意

The company planned on Monday to announce fare Guard, a service that guarantees that an airfare listed on the site will remain valid for a week, or Farecast will make up the difference.

公司计划在星期一宣布票价保护，这项服务保证在网上公布的的票价在一周内有效，否则机票预价就没有什么用了。

Little ones, be on your guard and try to remain as peaceful as possible for I will call on many of you to sound the last trumpet at a moment's notice.

小人儿s，保持警戒，尽可能保持平静，因为我会一经通知就请你们很多人去吹响那最后的号角。