1. People have joys and sorrows, and the moon waxes and wanes. This is a difficult thing in ancient times.

2. Life is like a song, with ups and downs in pitch and ups and downs in melody; life is like a book, full of ups and downs, recording joys and sorrows; life is like a game of chess, full of dangers. , is also full of opportunities; life is like a road, with ups and downs and smooth roads; life is like a river, sometimes with twists and turns, and sometimes with a sudden plunge.