The popular explanation of dimensionality reduction attack is that advanced creatures attack low-level creatures, which is used to describe the situation of crushing strength. For example, in an industry, people who exist like gods suddenly appear in front of ordinary people, and then abuse them to death with their professional knowledge, such as meeting a five-star chef when cooking, Liu Xiang when running, and Jacky Cheung when singing.

The dimension reduction attack comes from the science fiction "Three-body" and is a weapon of the laws of the universe. Because it is too powerful, it has formed an absolute crush on the attacked object, so this word is widely used to describe the situation that the strength gap is wide and it is impossible to form confrontation.

Similar to the competition between Tsinghua Xueba and primary school students, the tug-of-war between elephants and ants, the speed of airplanes and snails, there is no possibility of resistance at all, because the strength has been crushed and can only be done.

In the novel, the dimension reduction attack is to launch a small two-dimensional space fragment at a certain area in the three-dimensional universe (usually the area where hostile civilizations are located), and the fragment is encapsulated by a force field. After the force field evaporates, the two-dimensional space will fall to the two-dimensional space, and the whole space will fall to the two-dimensional.

The falling process in this range will never stop, and the diffusion speed is the speed of light. Everything in this space will be reduced to two dimensions, thus achieving the effect of complete destruction.

Because the scope of action may expand, the attacker himself may eventually drop to a low dimension, so the use is generally limited. However, the civilization that attacked the solar system seems to have begun to transform itself to adapt to the low-dimensional universe, thus eliminating its opponents and avoiding its own demise. But it may also lead to the consequences of the whole universe eventually falling to a low dimension.