目前游戏只允许添加：攻击、防御、醒目三类标记。这远远不能够满足玩家对于城市规划的需求，因此我们需要能保留在地图上方便我们进行城市规划布局思考的标记功能。


Now, the game only enable players to make three kinds of mark：attack, defend and eye-catching(i don't really know the offical english name of this kind of mark). But they are far too weak to satisfy our players' need to make allocations plan in advance. So we do need new 'mark' funcation to hlep us think and play.