欧洲的交流电输出频率通常为50赫兹。In Europe, AC is usually generated at 50 Hz.你可在短波37.5赫兹上收到我们的节目.You can receive our program at short wave 37.5 MH.频率用赫兹即每秒钟的周数来计算.Frequency is measured in hertz, or cycles per second....
“把那个穿紫衬衫的家伙叫过来。”——“好的，老兄。”"Get the guy in the purple shirt." — "All right, my man."只要她拒绝他，他就会把她打得青一块紫一块。Whenever she refused, he'd beat her black and blue.略微发紫的大朵蓝花在6月初绽放。The large, purplish blue flowers appear in e...
月球的引力the gravitational pull of the moon卫星被射入环绕月球的轨道.The satellite was launched into orbit around the moon.月球的石头和地球的不同.The lunar stone is different from earth's....