la faille adaptation d un fait divers français

Well, 'un as bajo la manga' could translate to 'an item under the sleeve'. However, it's a bit of an odd phrase and the context could change the exact meaning. Maybe it's related to something being hidden or concealed in that area.

I have no idea about the story of 'la pecera de un beta' manhwa. You might want to check with people who are into manhwa or search for it on social media groups dedicated to manhwa discussions.

I think it might mean 'a ace under the sleeve' but I'm not sure. You might want to check with a proper dictionary or translator.

Here are some famous divers: - In China, there were Chen Xiaoxia, Zhou Jihong, Fu Mingxia, Guo Jingjing, Wu Minxia, Chen Ruolin, He Zi, Quan Hongchan, Wang Hao, Gao Min. Among them, Gao Min was China's first Olympic springboard diving gold medalist, with many career champions and outstanding achievements in many competitions; Fu Mingxia won the Barcelona Olympic women's 10m platform gold medal at the age of 13, and was the first Chinese Olympic athlete to win three consecutive championships; Guo Jingjing was known as the "Diving Queen"; Wu Minxia was the first female Olympic "Metal" winner in Chinese history; Chen Ruolin was the first diving athlete to win the Olympic Games, the World Championship and the World Cup 10m platform single and synchronized diving championship and achieve a grand slam. - There's Klaus Dibiasi abroad Klaus Dibiasi, an Italian male diver, participated in the diving competitions of the 1964, 1968, 1972 and 1976 Summer Olympics. He won three gold medals and two silver medals. He was the first Italian to win an Olympic diving gold medal. He also won the platform event in the 1973 and 1975 World Swimming Championships. There was also Russia's Dmitry Saudin, known as the " diving tsar," who was one of the world's most well-rounded top divers, and Britain's Tom Daley, who had participated in many Olympic Games and retired after the Paris Olympics at the age of 30. While watching the Olympics, you can also read the wonderful novels related to the Olympics!

I'm not really sure. Maybe it's some kind of special or additional story related to a specific manhwa.