Shen You'an adjusted the glasses on her nose bridge and calmly said, "When constructing the concept of derivatives, there is one very crucial question."
Shen You'an picked up a portable hard drive from the podium and showed it to the class. "Why do two hard drives with identical volume have different storage capacities?"
Someone answered, "Because the material is different."
"If a hard drive is given, how can you maximize its capacity?"
This stumped everyone.
