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Answer: Metaphorical rhetorical techniques are used.
"The calendar is like a pine tree, and a page of the calendar is like a petal. When the petals fall, it will bear fruit." The poem uses metaphor to compare the tearing off of the calendar day by day to pieces. The petals fall, and from a plant's point of view, only when they bloom will they bear fruit, and it is natural for flowers to fall and fruit to appear. The same goes for life. As long as you live seriously and work hard, you will always reap rewards for your hard work. The falling petals can be compared to the labor you put in, which are the days that have passed, and the rich fruits are the rewards of the harvest. The poem uses metaphors to reveal the truth that hard work will eventually be rewarded, and is full of optimism and upward spirit.