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The difference between mud cows sinking into the sea and stones sinking into the sea

Mud cows enter the sea-once they sink to the bottom of the sea, they disappear after being melted by water. Metaphor is gone forever, and there is no news.

The stone sank into the sea-the stone sank into the sea. Metaphor has never been seen or heard; It is also a metaphor that things have no following.

The difference between the two is that the former has no hope, and the latter always has hope even if it is looking for a needle in a haystack.