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張又俠曾被視為習近平在軍中最核心的盟友。兩人的父輩是革命戰友，都是陝西籍的西北軍領袖。
"Birds can actually morph their wings," says Upmanyu. "They have perfected this highly efficient way to fly." Aircraft and wind turbines might one day do something similar. Upmanyu suggests that the wing could automatically and dynamically respond to air pressure, using a valve-based system to adjust its shape.