Yu Guangzhong's "Four Rhymes of Nostalgia", what is the red color of the begonias?

The red of begonias in "Four Rhymes of Nostalgia" is one of the four rhymes of nostalgia that the author wants to express, and it does not refer to anything in particular, but to emphasize the "red" with "a red begonia" to highlight the bright and brilliant "red", which is naturally connected with the "blood" in the latter part of the text. The "red" is naturally connected with the "blood" in the following article; the "white snowflake" is used to emphasize the "white". "white", white crystal clear, spotless, and this "white" word and the back of the "letter" is closely linked; with "a wax plum fragrance "to emphasize" incense "to highlight the fragrance of the plum, refreshing, and this" incense "word and the following" mother "connected.

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