vernacular: reading thousands of books is equivalent to traveling to Wan Li.

2. Black hair doesn't know how to study early, while white hair regrets studying late. -song Yan Zhenqing

vernacular Chinese: when I was a teenager, I only knew how to play, but I didn't know how to study hard. Only when I was white-haired did I regret studying late.

3. The book is affectionate like an old friend, and it is gloomy and happy in the morning.