Plumbane
烃基铅
🗣️ 情景例句
Please give him the message.
请转告他。
Good night,John.
晚安，约翰。
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。