Once they identified the likely hiding place, they developed devices to detect the painting by firing neutrons into the wall.
一旦确定油画可能藏身之地,他们会利用专门设备,对墙壁发射中子束,找出油画。
2
The reason is that the condition for firing Rule 2 that was once true is not true anymore because it references an object (objectB) that is no longer part of the knowledge.
And you will have fun en route, though not nearly as much as you'll have once you get that language in working order and take it out to the firing range of the real world!