《大象守护者：一位泰国女性拯救获救象群的毕生使命》
Saengduean Lek Chailert was five years old when she first saw an elephant. The chained animal trudged past her home…
Category: Environment
Environment
研究人员可能已找到解决磁悬浮列车在隧道中引发冲击波的方案。
Researchers believe they may have solved the “tunnel boom” issue as China prepares to introduce its newest magnetic levitation train…