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This book is based on the author's own experience, before the college entrance examination - college - serving as a soldier - returning to college after serving as a soldier - going out to study skills - teaching in Xinjiang - now. Changes in love, work, life, and thoughts will all be reflected, until we finally discover that youth is like a double-edged sword. When we squander it wantonly, we never think about what will happen if we lose it...