No official permission has been given for the event to take place.

这项活动未得到正式批准，不能进行。

He told me that I had no business being in there without official permission.

他对我说，没有官方的许可，没有理由去那儿。

Do you think it necessary to ask for official permission for the event to take place?

你觉得进行这项活动，有必要得到正式的批准吗？

"There are no cats here, go away. No one is allowed inside unless you have official permission," a security guard said.

“有没有猫在这里，走，没有人是被允许进入，除非你有官方许可的，”一名警卫说。

If people want to move outside their birth hukou, they need official permission, which was virtually impossible to get before liberalization.

如果有人想把自己的户口迁出，一定要先获得官方许可，而这在目前几乎是不可能的。