"The good scenes of the year must be remembered, especially when it is orange, yellow and green." From Su Shi's To Liu Jingwen in Song Dynasty. You must remember that the best time of the year is the late autumn and early winter when oranges are golden and green.
Note: originally refers to the ancient king, and later refers to the title of respect for men, especially. Remember: you must remember. The most important thing is: one is "accuracy".