off ·phrase
Definition: If an area is off limits, you are not allowed to enter it. Level: C2
宫殿的大部分区域对公众禁止入内。
Most of the palace is ___off ___limits to the public.
对我们来说唯一禁止入内的地方是山的另一侧，因为那里太危险了。
The only place that was ___off ___limits for us was on the other side of the mountain, because it was too dangerous.
军事基地严禁未经特别许可的平民进入。
The military base is ___off ___limits to civilians without special permission.