Courtesy costs nothing

例句：

1. 1.She gave me a warm smile as she handed me the menu.
   她递给我菜单时，给了我一个温暖的微笑。
2. 2. He always greets everyone with a friendly smile and a firm handshake.
   他总是用友好的微笑和坚定的握手来问候每个人。
3. 3. The hostess was very gracious in her courtesy to all guests.
   女主人对所有客人都非常有礼貌。