"Plum" refers to plum blossom, which is called "cold plum" because it blooms in cold winter. Treasure is telling and reporting, which can be interpreted as a sign here. "Spring" of course refers to spring. Therefore, "cold plum blossoms herald spring" means plum blossoms herald the arrival of spring.
Mao Zedong's recent love? There is a saying: "Joe does not strive for spring, but only reports spring." When she was in bloom, she laughed in the bushes. " I'm talking about the cold plum blossom in spring.