"Yes, it indeed is troublesome," the expert in mechanical engineering discussed, "Many technological advancements are essentially advancements in material science."
"If we lack rare earth elements, it's difficult to make progress in material science, naturally making it impossible to develop powerful engines. Even some composite ceramics require rare earth elements."
How important are rare earth elements?
In material science, they are as essential as oil!
Take engines for example: In the era of turbojet engines, the gap between the turbine blades and the casing was wide, and the temperature in front of the turbine was lower, keeping the amount of deformation of the turbine blades within controllable limits—conventional materials could suffice.
