日本JAXA成功完成Mach-5冲压发动机地面试验，未来有望实现东京到洛杉矶两小时内飞行，推动高速航天技术发展。
A successful Japanese trial of a ramjet engine designed for Mach‑5 aircraft
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Transportation
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Southeast Asia’s turn to crops for fuel leaves less for food and exports
Southeast Asia’s shift to biofuel crops like palm oil is cutting into food supplies and export revenues, raising concerns over food security and economic stability.
US scrambles to stop Internet users re-creating dead pilots’ voices
The US NTSB has temporarily suspended public access to its investigation database after AI was used to reconstruct pilots’ voices from cockpit recordings, raising privacy concerns.
Hitachi lands deal for Mexican railway signaling system
Hitachi wins a €168 million contract to install signaling and telecom systems on a 396-km railway line in northeast Mexico, expanding its transportation footprint.
