Sinuidal
正弦波; 正弦形
🗣️ 情景例句
Sometimes there is,
有时候有，
I expected No.2 to win.
我以为2号会赢。
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。