sour grapes
The story of the fox who wanted to take the grapes but couldn't and said poor loser, "They must be sour grapes. Sometimes you actually eat it and it tastes sour.
There is a way to tell the difference between sour grapes and sweet grapes, but if you don't know how to do it
Sour grapes are left where they are easy to get.
If you eat the grapes where they are easy to get, they are sour.
Knowledge can sweeten the pot, but we don't know it.
The sugar content of sweet persimmons (persimmons that are not astringent) is around 16 degrees, but astringent persimmon has a sugar content of around 20 degrees. When this astringent persimmon is dried, the astringency and water are removed, and the sugar content reaches as high as 50 degrees. Everyone is happily picking persimmons, so I picked some myself, ate them straight away and said, "Astringent!" I picked a persimmon myself and ate it as it was.
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