Now that you know how to add and delete rows, let's try building a simple application that demonstrates this in practice.

现在您已经了解了如何添加和删除行，接下来让我们尝试构建一个简单的应用程序来进行实际演示。

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The drawing software lets the user expediently add, delete, move and modify fire detection or fire fighting facilities on the building floor maps.

其制图部分使用户可以方便地对楼层图上各种消防设施和房间标志进行添加、删除、移动、修改及尺寸变换；

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