Why is the Chinese government issuing ultra-long treasury bonds?

①The Chinese government will start issuing its first ultra-long treasury bonds on Friday. What's the background? (00:48) ②Pakistan’s Deputy Prime Minister and Foreign Minister Mohammad Ishaq Dar is visiting China this week. (13:12) ③Data shows top-tier sovereign wealth funds from the Middle East significantly increased their holdings in China's A-share listed companies in the first quarter of this year. What are the details? (25:20) ④OpenAI has unveiled its latest artificial intelligence large language model. (36:00) ⑤The third Global Trade and Investment Promotion Summit has launched the Beijing Initiative, calling for an open, transparent, multilateral trading system.(45:20)