The two-way foil is widely known on Earth because of "The Three-Body Problem", and the dimensional weapons of the same series have caused the "Three-Body Problem" universe to fall step by step from the ten-dimensional pastoral era to the three-dimensional era where even true light-speed travel is difficult to achieve.

However, the two-way foil is a cheap sanitizing weapon commonly used by higher civilizations in the "Three-Body Problem" universe, rather than the weapon they mainly use for combat, and the technical difficulty should not be too great.

Scientists have heard that the coalition government has discovered the "Super

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