[Guterres Warns of Serious Consequences if Strait of Hormuz Remains Closed] On April 30, local time, UN Secretary-General António Guterres held a press conference at UN Headquarters in New York regarding the Middle East crisis. He pointed out that the crisis is entering its third difficult month, and despite a fragile ceasefire, the situation is deteriorating over time. Guterres expressed deep concern about the restrictions on freedom of navigation in the Strait of Hormuz. Guterres stated that if the strait remains closed until the middle of this year, global economic growth will drop to 2.5%, inflation will rise to 5.4%, 32 million more people will fall into poverty, and 45 million more will face extreme hunger. If the strait remains closed until the end of the year, global economic growth will drop to 2%, and inflation will exceed 6%. Guterres urged all parties to avoid any actions that could undermine the ceasefire. Guterres stated that the UN system is working to mitigate the impact of the current crisis. (CCTV News)

[Chinese Scientists Uncover the Key Physical "Black Box" Limiting Perovskite Solar Cell Efficiency] A Chinese research team has for the first time uncovered the key physical "black box" limiting the efficiency of formally structured perovskite solar cells, innovatively proposing a continuous gradient doping electron transport layer design. Based on this strategy, the solar cell device, certified by international authoritative institutions, achieved a steady-state photoelectric conversion efficiency of 27.17% and a reverse scanning efficiency of 27.50%, setting a new record for the highest photoelectric conversion efficiency of formally structured perovskite photovoltaic devices. This research was achieved by a team led by Professor Yuan Mingjian and Distinguished Researcher Jiang Yuanzhi from the College of Chemistry, Nankai University, in collaboration with a team led by Researcher Xu Jian from Beijing Institute of Technology. The relevant research results were published online in the international academic journal *Nature* on April 30th, Beijing time. (Xinhua News Agency)

[Chinese Scientists Uncover the Key Physical "Black Box" Limiting Perovskite Solar Cell Efficiency] A Chinese research team has for the first time uncovered the key physical "black box" limiting the efficiency of formally structured perovskite solar cells, innovatively proposing a continuous gradient doping electron transport layer design. Based on this strategy, the solar cell device, certified by international authoritative institutions, achieved a steady-state photoelectric conversion efficiency of 27.17% and a reverse scanning efficiency of 27.50%, setting a new record for the highest photoelectric conversion efficiency of formally structured perovskite photovoltaic devices. This research was achieved by a team led by Professor Yuan Mingjian and Distinguished Researcher Jiang Yuanzhi from the College of Chemistry, Nankai University, in collaboration with a team led by Researcher Xu Jian from Beijing Institute of Technology. The relevant research results were published online in the international academic journal *Nature* on April 30th, Beijing time. (Xinhua News Agency)