According to the ancient book "Piya. Shi Yu" recorded: "It is said that a fish leaps over the dragon gate, and then becomes a dragon, only the carp is possible." "Worm Fan. Object" recorded: "Carp..... The yellow one climbs Longmen Mountain against the current every spring every year, and the heavenly fire burns its tail from behind, and turns into a dragon. "The world often uses the metaphor of "carp jumping the dragon gate" to raise and promote officials. Later, it was used as a metaphor for going against the current and striving forward. [Original text ]