In the cold winter of 1977, the spring breeze that thawed knowledge had not yet blown into the small northern village. Lin Yu, 19, wrapped in a patched blue shirt, stood in front of the cracked blackboard of the commune primary school and played with fate with half a piece of chalk. She carried banned books in exchange for eggs in her arms, and filled the lining of her cotton-padded jacket with formulas filled with madder juice. However, in literacy class, she disguised hyperbolic equations as spring plowing reports, and hid Fourier transforms in barefoot medical books.
When the jeep of the Academy of Military Sciences crushed the silence of the campus, Zhao Yushi, a highly intelligent officer, broke into her world with Soviet sonar blueprints. Inverse trigonometric tables were engraved on his military boots, and a magnet was embedded in the cap of his pen. Under the cover of a debugged radio, he hid the submarine's sonic code in the aroma of roasted sweet potatoes. The two of them deciphered Morse code under a kerosene lamp and used a hot towel to melt the ice that had frozen the papyrus until the veteran soldier Zhao Deshan broke into the classroom with an artillery shooting watch and photographed the marriage order as the focus of the hyperbolic equation.
This is a battle of pencils against shackles. When the college entrance examination admission ticket is mixed in the brown rice bag and reappears, the tide of the Bohai Bay is washing the function curve into the channel of destiny. In the era of torn knowledge and confinement, those mathematical symbols wandering on the blackboard will eventually become the starlight that pierces the iron curtain.
Intention: Independence