1, rather critical: You know that autumn has come when you see a fallen leaf. Metaphor can predict the development trend of things from subtle signs.

2. Pronunciation: [y and y è zh and qi ū]

3. Source: Liu An in the Western Han Dynasty, "Huainanzi said mountains and rivers": "When you are young, you will know the age when you see a leaf falling, and you will know the cold in the world when you see the ice in the bottle."

4. Example: Lao She's Four Generations under One Family: "When people see pears and jujubes, they will feel' rather critical'."

5, near meaning: see the micro-knowledge of the fallen leaves and know the autumn, see the micro-knowledge of the taste, see the big because of the small.