At present, widely used mechanical metamaterials have excellent characteristics such as negative thermal expansion, high strength and stiffness at low weight. However, once this mechanical metamaterial is constructed, its properties cannot be changed or adjusted. Recently, researchers have developed A new material overcomes this problem. It is certain that in the near future, robots, smart wearable equipment and other fields will definitely change their appearance. Which of the following, if true, would best support the above conclusion. ['At present, there are scientific research teams and research teams of this achievement to discuss the specific application prospects of this new material.', 'From the synthesis of a new material to the practical application of the material, there are many unpredictable difficulties to be overcome.', "The stability of this new material's response to magnetic fields and the requirements for magnetic field strength are still being repeatedly tested and tested.", 'History proves that every breakthrough in new technology and new materials will cause rapid changes in related application fields.']