" I think it'll be part of the magic of the room, " said Hermione. " If you need it to be unplottable, it will be."

“我想这是那间屋子魔法的一部分，”赫敏说，“如果你需要它在地图上显示不出来，就显示不出来。”

We do not know whether the enchantments we ourselves have placed upon it, for example, making it Unplottable, will hold now that ownership has passed from Sirius's hands.

比如说，房子的所有权不归小天狼星了，我们就不知道我们原来给它施的一些魔法，比如让它无法在地图上标绘等等，现在还管不管用。