Prepressurization
预加压
🗣️ 情景例句
Are you free?
您有空吗？
So long.
再见
In 1929, three years after his flight over the North Pole, the American explorer, R.E.Byrd, successfully flew over the South Pole for the first time.
美国探险家 R。伯德在飞越北极3年之后，于1929年第一次飞越了南极。