hums/hʌm/名词持续低沉的噪音;嗡嗡声There's an annoying hum on this computer.这台计算机总是发出一种让人心烦的嗡嗡声。/hʌm/动词发出连续低沉的声音,嗡嗡作响What's that strange humming sound?那种奇怪的嗡嗡声是什么?想跟读,去练习